Question

The 2nd 31th term and the last term od am ap are 31/4,1/3,-13/2 find the first term and the number of term

Answer 1

a=31/4
2nd =31
tn=a+(n-1)d
t2= 31/4+(2-1)-89/12
t31=31/4+1.-89/12
t31=31/4-89/12
t31=93/12-89/12=6/12
1/2 is answer