Question

In A.P if the 12 th term is -13 and the sum of its first 4 terms is 24 . Find sum of its 10 terms

Answer 1

10th term and service 200

Answer 2

T12=a+11d

a+11d=-13...........equation 1

then

S4=4/2(2a+3d)

24=2(2a+3d)

2a+3d=12...........equation 2

on solving both the equations....we get

d=2

so putting d=2 in equation 1

we get...

a=7..

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