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Question

The number of positive integers n in the range 12n40 such that the product (n 1) (n - 2) ... 2. 1 is not divisible by n. is:

A
5
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B
7
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C
13
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D
14
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Solution

The correct option is A 7
if (n1)! is not divisible
by 'n' then 'n' must be
prime
b/w 12 & 40, these are
'7' prime no; hence answer
is 7

1093594_513624_ans_d5bfd051c77b4ca8b50401806037967a.jpg

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