Question

Sum of n term is 5n 2 +2n, find 12th term.

Answer 1

S

n

​

=5n

2

+2n(Given)

First term (S

1

​

)=5⋅(1)

2

+2⋅1=7

Sum of first two terms (S

2

​

)=5⋅(2)

2

+2⋅2=24

Therefore,

Second term =S

2

​

−S

1

​

=24−7=17

hope it helps