Question

In an A.P. first term is 1 and last term is 11 and sum of n

terms is 36, then n equals-

• A. 5
• B. 6
• C. 7
• D. None of these

Answer 1

Answer: (B)

6

Answer 2

36 = $\frac{n}{2}$ (1 + 11) ̃ n = 6