Question

if the sum of first 'm' terms of an A.P is 3m2-m and its comm difference is 6 then find its first term​

Answer 1

Step-by-step explanation:

GIVEN THAT

• the sum of first 'm' terms of an A.P =

$3 {m}^{2} - m$

Common difference = 6

SOLUTION

we put m = 1

so the first number of A.P = 3-1 = 2

Now A.P = 2,8,14,20,......