Question

The sum of first n terms of an AP is 3n²+4n. Find the 25th term of this AP.

Answer 1

Step-by-step explanation:

Given : APn:3n2+4n

AP25term=3(25)2+4(25)[n=25]

                      =1875+100

                      =1975

AP24terms=3(24)2+4(24)

                      =1824

25thterm=AP25term−AP24term

                      =1975−1824

                      =151