Question

The sum of n terms of an ap is 3n2-n . Find a and d

Answer 1

hey here is Ur answer

let take n as 1,2,3

solution is here

3n2-n

»»»n=1

=3*1*2-1

=6-1

=5

»»»n=2

=3*2*2-2

=12-2

=10

»»»n=3

=3*3*2-3

=18-3

=15

now the AP will be 5,10,15

a = 5

d = 10-5

=5

hope it helps u a lot

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