Question

The first and last terms of an A.P. are 1 and 11. If the sum of its terms is 36, then the number of terms will be
A. 5
B. 6
C. 7
D. 8

Answer 1

Answer:

5 is the best answer the question

Answer 2

B. 6

Step-by-step explanation:

Given: The first and last terms of an A.P. are 1 and 11.  sum of its terms is 36

Find: n

a = 1

L = 11

Sum = n/2 (a + L)

 36 = n/2 (1 + 11)

 36 = n/2 (12)

 n = 36 * 2/12 = 6

Therefore number of terms = 6

Option B is the answer.