Question

Let be a sequence such that a1 + a2 +....+ an=$\frac{n^2+3n}{(n+1) (n+2)}$ If $28 ∑^{10}_{k=1} \frac{1}{a_k} = P _1 P_ 2 P _3 . . . P_ m$ , where p1, p2, …..pm are the first m prime numbers, then m is equal to

• A. 5
• B. 6
• C. 7
• D. 8

Answer 1

Answer: (B)

6

Answer 2

The correct option is(B): 6