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Q.

If 15k divides 47! But 15k+1 does not divide it, then k =

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a

15

b

12

c

10

d

5

answer is C.

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Detailed Solution

  E15 47!E3 47!=473+479+4727 =15+5+1=21E5 47!=475+4725=9+1=10E15 47!=10  ⇒  k=10

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