Question

t7 =34t15=74 then t40​

Answer 1

if these are in ap then

a+(7-1)d=34

a+6d=34..........(1)

so, a+14d=74..........(2)

form eqn 1)

34-6d+14d=74

8d=40

d=5,

eqn 1.

a+6.5=34

a=4,

t140=a+139d=4+139×5=4+695=

t140=699