Question

If the sum of the first n terms of an ap is given by sn=3n2-4n

Answer 1

Answer:

Given Sn = 3n^2 -4n

Sn = Sum of n numbers

n can be 1,2,3,4,.....

Nth term of an A.P = a+(n-1)d

First term = 3(1)^2 - 4(1) = 3-4 = -1

Sum of 1st and 2nd term = 3(2)^2 -4(2)

= 3(4) - 8

= 12-8

= 4

Second term = Sum of 1st and 2nd term - First term

=4-(-1) = 5

Difference between 1st and 2nd term = 5-4= 1

A.P = 4,5,6,.....