# pre-calculus

posted by
**James**
.

Prove 3+4+5+...+(n+2) = [n(n+5)]/2 for n>4

Do the first step in a proof by induction.

posted by
**James**
.

Prove 3+4+5+...+(n+2) = [n(n+5)]/2 for n>4

Do the first step in a proof by induction.