Question

nth term of an A.P. is 7n + 4. The common difference is ______.

विकल्प

• 7n

• 4

• 7

• 1

Answer 1

nth term of an A.P. is 7n + 4. The common difference is 7.

Explanation:

Given,

T_n = 7n + 4       ...(nth term at an A.P.)

Put n = 1, T₁ = 7(1) + 4 = 7 + 4 = 11

Put n = 2, T₂ = 7(2) + 4 = 14 + 4 = 18

Put n = 2, T₂ = 7(2) + 4 = 14 + 4 = 18

= T₂ − T₁ = 18 − 11 = 7