Question

Question 3 (ix)
In an AP:
(ix) Given a = 3, n = 8, S = 192, find d.

Answer 1

(ix)
$Giventhat,a=3,n=8,S=192As{S}_n=\frac{n}{2}[2a+(n-1\left)d\right]192=\frac{8}{2}[2\times 3+(8-1\left)d\right]192=4[6+7d]48=6+7d42=7dd=6$