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## FAQ

In a lottery game, there are 5 numbers drawn out of 90. How many tickets do I need, and how do I fill them out, for making sure I will have 4 matches?

You are asking for the domination number[1] of a certain Johnson graph[2] (please, no Big Lebowski jokes). In standard notation, this number is denoted [math]\gamma(J(90,5))[/math].(Note: I'm assuming that the “5 numbers drawn out of 90” are all different, which I believe is the case in most lotteries).The Johnson graph [math]J(90,5)[/math] is the graph whose vertices correspond to all the [math]5[/math]-element subsets of [math]\{1,2,\ldots,90\}[/math], and two vertices are adjacent (connected with an edge) whenever the corresponding sets have [math]4[/math] elements in common. For example, [math]\{2,3,5,8,13\}[/math] is adjacent to [math]\{2,3,8,13,77\}[/math] but not to [math]\{2,3,5,9,14\}[/math].A dominating set for a graph is a set of vertices that is adjacent to each vertex not in the set. If you have a dominating set of tickets for [math]J(90,5)[/math], whatever the winning combination turns out to be has at least [math]4[/math] matches with a ticket in your hand.Calculating the size of a minimal dominating set, called the domination number, is computationally hard (the corresponding decision problem is NP-complete), and our graph [math]G=J(90,5)[/math] is no peanut: it has [math]N=\binom{90}{5}=43\,949\,268[/math] vertices, each with [math]d=5(90-5)=425[/math] neighbors.Of course, [math]G[/math] is a very specific and highly symmetric graph, so it's entirely possible that a minimal dominating set for it, or at least a relatively small dominating set, can be determined explicitly using some reasoning particular to this case.As with any optimization problem, we can pursue two competing paths: we may seek upper bounds by exhibiting some good dominating sets, and we can seek lower bounds by attempting to prove that every dominating set must be at least as large as some size [math]B[/math].Since the degree of [math]G[/math] is [math]425[/math], a dominating set must have at least [math]N/425[/math] elements, which sets a lower bound of [math]B=103\,411[/math] tickets. With fewer tickets than this you stand no chance of guaranteeing a four-element match. I suspect there is, in fact, a dominating set of this size, or very close to it.An equally obvious upper bound is obtained by simply scanning all [math]4[/math]-number combinations [math](a,b,c,d)[/math] in our range and filling in the fifth number arbitrarily. This yields a dominating set of size [math]\binom{90}{4}[/math]. That's about 2.5 million tickets, which is far more than the theoretical lower bound, but it's also far less than the 43 million possible winning combinations.Of course, this is very wasteful. We made no use of the fact that each ticket can cover five [math]4[/math]-number combinations, not just one. A better approach is to use a standard trick in design theory or coding theory: impose a linear constraint.Specifically, consider those combinations where the sum of the numbers is divisible by [math]90[/math]. About [math]1/90[/math] of the combinations are special like that (The exact number is [math]488\,326[/math], which is just [math]N/90[/math] rounded up).Suppose you filled tickets with all of these special combinations. If the winning one happens to be special, you got it. If it's not, then in almost all cases it has four numbers in common with not only one but five of your special combinations.The reason is that given any winning combination [math]\{a,b,c,d,e\}[/math], you can keep [math]a,b,c[/math] and [math]d[/math] intact and find an appropriate fifth number [math]x[/math] (instead of [math]e[/math]) which makes the sum [math]a+b+c+d+x[/math] divisible by [math]90[/math]. The combination [math]\{a,b,c,d,x\}[/math] is then in your hand, unless it so happens that [math]x[/math] is identical to one of [math]a,b,c,d[/math]. In this case you can try picking another element of the winning combo, say [math]d[/math], and try [math]\{a,b,c,y,e\}[/math] whose sum is divisible by [math]90[/math]. Once again, we just need to hope that [math]y[/math] isn't identical to one of the other four numbers.For example, suppose the winning combination was [math]\{1,2,3,42,60\}[/math]. The quadruplet [math]\{1,2,3,42\}[/math] is nowhere to be found among the special combinations, because the missing fifth number would have been [math]42[/math] itself. However, that's ok because [math]\{1,2,3,24,60\}[/math] is special, and matches four of the numbers in the winning combination. We can't “fix” the [math]60[/math], but we can fix any of the other numbers.In very rare instances, a winning combination may not be “fixable” at all. For example, suppose that the lottery was played with three numbers instead of five. The winning combination [math]\{10,40,70\}[/math] cannot be modified into a special combination by changing any single number.If that had happened in our case, we would simply have added a few tickets to cover for those pathological cases. But I'm quite sure that's not necessary: as far as I can tell there aren’t any “bad” combinations of five numbers in the range 1 through 90.The set of special tickets guarantees winning the lottery, but it’s still about 4.7x larger than the theoretical lower bound. This isn't surprising because, as we said, most winning combinations are actually covered by 5 of our tickets, though sometimes it's just 4. That's where this factor of 4.7 comes from.We can seek various pruning techniques to find winning sets of fewer tickets, but I couldn't yet find one that'll take you down to around 110,000 tickets. I'm 100% sure this is addressed in the literature, and I'll update this answer if I find anything.Footnotes[1] Dominating set - Wikipedia[2] Johnson graph - Wikipedia

4 inlet pipes with circular cross-section take 9 hours to fill a cistern. How many pipes of half the radius are needed to fill it in 6 hours, if the speed of water is thrice the earlier speed?

Let radius = r speed = vno of pipes = 4total time = 9 hoursSo, total volume = (pie * r^2) * 9 * v * 4Now, new radius = r/2new speed= 3vtotal time = 6 hours n of pipes be xSo, (pie * r^2) * 9 * 4 = (pie * (r/2)^2) * 6 * 3v * xi.e x = 88 Pipes are required.

If you have 4/5 of water and it can fill 2/3 of a bucket, how much water do you need to fill the whole bucket?

Presume you have 4/5litres of water and this is = only 2/3 of bucket of total volume ‘V’4/5=2/3 x V4litres /5 = 2V/3..After cross multipling12 litres =10 VTherefore V =12 litres/10 =6/5 litres =1200cc. Or1.2 litres.Or 1 and 1/5 litres

How do I fill the application form for the post of deputy manager that requires a BE degree for Aavin Recruitment 2022. when there is no option to fill BE in the education qualification section?

If you find there is no drop down menu name for the BE ( mechanical) then select the closet graduate Enineer one and complete the form quickly as your deadline is approaching fast .As an additional safety you can write application on paper too mentioning all details as per online option and send it by speed post. Remember this is additional safety excercise of not missing the opportunity.

I can see that one of our competitors has 4 out of 5 stars shown in Google adwords - when I click on the customer reviews they have an avg. score of 2.6 out of 5 stars. How have they managed to work the numbers?

Check your competitor's ratings on zagat.com .. By Google's own recent declaration all reviews on Google+ Local will now carry ratings drawn from zagat.com (ref.: http://googleblog.blogspot.in/20...)If Google Adwords too is drawing star ratings from Zagat.com, that will be a news. Please confirm and share some screenshots in this thread, if possible.

If 4/5 of a cistern is filled in 1 minute, how much more time will be required to fill the rest of it?

0.25 minutes

If 4 by 5 of a water tank is filled in one hour, how much time is required to fill the rest of it?

If the tank has 5 units, out of which 4 units are filled in one hour. Meaning, 1 unit is filled in 60 minutes divided by 4 units i.e. 15 minutes. It takes 15 minutes to fill one unit of the tank and four out of five are already full, so it will take an additional 15 minutes to fill the last part. Making the total time taken = 1 hour 15 minutes(75 minutes)

How many packets are required to fill 20 4 by 5 litres of curd so that each packet contains 4 by 6?

《8》(204×5)/(4×6)=5×15/6=75/6=25/3=8+(1/3)

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