Question

the sum of first n term of an a.p. is 3n+n×n then find first term and sum of first two terms, find 2nd , 3rd and 15th term.​

Answer 1

Answer:

first term of this ap is

3n+n×n

3×1+1×1

=4.

sum of first 2 terms is 10.

second term= 6.

third term=18.

15th term=270.