Question

If 8th term of an
a.p is 37 and its 12th term is 57. find the
a.p and hence find its 31st term.

Answer 1

8th term (a+7d) and 12th term is(a+11d)
ie. (a+7d)..............................(1)
and (a+11d)...........................(2)
4d=20
d=5. sub.in ........(1)
a+7(5)=37
a+35=37
a=37-35
a=2