Write the common difference of an A.P. whose nth term is a n = 3n + 7.

Question

Philoid · Accepted Answer

If a_n = 3n + 7

Then a₁ = 3 (1) + 7 = 10

a₂ = 3(2) + 7 = 13

a₃ = 3(3) + 7 = 16

d= common difference = a_n – a _n–1

= a₃ – a₂

= 16 – 13 = 3