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kevincan
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Hello Marty, the question is asking for the greatest integer X, not the smallest integer.

x = 6.dd
[x] = 6
IMO Option B should be the correct answer.
Correct me if I am wrong?
MartyMurray
There are 25 prime numbers less than 100. 130 people each chose a two-digit prime number. What is the smallest integer x such that there must be at least x people who chose the same prime number?

Find number of one-digit prime numbers:

2, 3, 5, 7

Number of one-digit prime numbers = 4

Find number of two-digit prime numbers:

25 - 4 = 21

Find minimum number who chose the same number:

130/21 = 6.dd

x > 6

x = 7

A) 5
B) 6
C) 7
D) 8
E) 9


Correct answer: C
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Isn't the greatest integer function of 6.dd is supposed to be 6. IMO option B should be the correct answer
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As 6< 130/21 < 7, it must be that at least 7 people chose the same prime number.
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doloribusnobis
Hello Marty, the question is asking for the greatest integer X, not the smallest integer.

x = 6.dd
[x] = 6
IMO Option B should be the correct answer.
Correct me if I am wrong?

"At least" means the guaranteed minimum.

So if we distribute 130 people over 21 primes each prime is selected a minimum of six times.

"The greatest" means the highest possible X that can be guaranteed. 7 can be guaranteed because even when we try to minimize the distribution of the remaining four people obviously four distinct primes are selected once again for a total of seven selections for those primes.

Can eight or more selections be guaranteed?

No, because there's nothing forcing eight or more to be selected since the lower number seven works.
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