Related Post: 1 * 2 2 * 3 3 * 4 N N 1 Formula 1 1 2 2 3 3 N N Formula 1 * 2 + 2 * 3 + 3 * 4 + N + 1 Formula 2^0+2^1+...+2^n-1 Formula 2/3+3/4+1/2 Solve 1/2 2/3 3/4 Sequence Formula