Question

if the sum of the first n terms of an A.P. is given by 4n-n2, find its 10 terms

Answer 1

Answer:

Ap =  4n-n2

find = 10 term

hence ap = 2 ,4,6,8,10,12..........

so a=2 , d = 4-2 = 2

n = 10

AN th = a + (n-1) d

           = 2 + (10-1)2

            =2+18

            = 20             answer

Step-by-step explanation: