Question

In an ap 19 th term is 52 and 38th term is 128 find sum of first 56 terms

Answer 1

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Answer 2

A+18d=52

a+37d=128

______________

19d=76, d=76/19 = 4

a= -20

then sum of 56terms

=(2(-20)+55(4))56/2

=180×28

=5040