Question

(ix) given a =3,n=8, S=192, find d.​

Answer 1

Step-by-step explanation:

sn=n/2(2a+(n-1)d)

192=8/2(2×3+(8-1)d)

192=4(6+7d)

192/4= 6+7d

48=6+7d

48-6=7d

42=7d

42/7=d

6=d

I hope it's helpful