Question

express in factorial notation (n+2)(n+1)n

Answer 1

we know n! = n(n-1)(n-2)........
so if we multiply n! with (n+1)(n+2) then it becomes (n+2)! which is (n+2)(n+1)n (n-1)(n-2).....

then we want to express (n+2)(n+1)n in factorial notation so it will be = (n+2)!/(n-1)!

hope it helps ....