k!(k + 1) = (k + 1)!
How does the left simplify to the expression on the right?
(I understand what factorial is, and I can find rules for multiplying two factorials, but I don't have any rules for multiplying a sum by a factorial.)
k!(k+1)=(k+1)*k!k!(k + 1) = (k + 1)!
How does the left simplify to the expression on the right?
(I understand what factorial is, and I can find rules for multiplying two factorials, but I don't have any rules for multiplying a sum by a factorial.)