Question

If 20 term of Ap is 1,4,7,10_ _ _ 20 teram find the sum of last 10 term

Answer 1

Suehehrrhwiwirurirurjieirirjrur

Answer 2

a=1,d=3,n=10
sn=n/2(2a+(n-1)d
=10/2(2*1+(10-1)3
=5(2+27)
=5*29
=145