Q.

10n+34n+2+5 is divisible by n∈N

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a

7

b

5

c

9

d

17

answer is C.

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Detailed Solution

On putting  n=2 in 10n+34n+2+5 We get102+3×44+5=100+768+5=873which is divisible by 9.
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10n+34n+2+5 is divisible by n∈N