Can we devise a formula for a series like this,
S=n+7(n-1+7(n-2+7(n-3+.........)))
when n=1 S=1 first three terms are 1,9,66 someone says it has a formula but i cant find any help!!!
Formula??
Can we devise a formula for a series like this,
S=n+7(n-1+7(n-2+7(n-3+.........)))
when n=1 S=1 first three terms are 1,9,66 someone says it has a formula but i cant find any help!!!