Question

convert it into factorial :- n(n+1)(n+2)(n+3)..........(2n)

Answer 1

Answer:

Step-by-step explanation:

we know ,

n ! = n( n -1)(n-2)(n-3) ......2×1

or

1 × 2 × 3 .......(n -1)n

now , here ,

(n + 1)( n +2)(n +3) .......( n +n)

or

( n +n ){ n+(n -1)}.......2× 1

2n !/n! = 2n(2n-1)....(n+1)

hence ,

answer is 2n !/n!