Question

In an AP given a=5,d=3,a^n=50,find n and s^n

Answer 1

a=5
d=3
an=50
an=a+(n-1)d
50=5+(n-1)3
50=5+3n-3
-3n=5+(-50)-3
-3n=5-50-3
-3n=-45-3
-3n= -48
n= -48\-3
n=16 answer