Question

the sum of first 7 terms of an ap is 10 and that of next 7 terms is 17. find the 8th term of the ap

Answer 1

Answer:

S7=10

s14=17

a8=?

10=7a+21d

and

17=14a+112d

so,

d=-3/70

a=109/70

a8=109/70+7×-3/70=39/35