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0 votes
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in Binomial theorem by (52.7k points)

Let an = (111...1)n times . Then

(A)  a912 is not prime 

(B)  a951 is not prime

(C)  a480 is not prime

(D)  a91 is not prime 

1 Answer

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Best answer

Correct answer (A), (B), (C),(D)

Since, a912, a951 and a480 are divisible by 3 then a91 is not a prime.

⇒ a91 is not a prime.

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