what-is-the-value-of-9-

Question Number 158050 by MathsFan last updated on 30/Oct/21

what is the value of

9!!

Answered by puissant last updated on 30/Oct/21

9!! = 9 \times 7 \times 5 \times 3 \times 1 = 945

Commented by MathsFan last updated on 30/Oct/21

please how

Commented by puissant last updated on 30/Oct/21

n!! = n (n - 2) (n - 4) \dots .

Commented by MathsFan last updated on 31/Oct/21

thanks

Commented by MathsFan last updated on 31/Oct/21

sir, what about n!!!

Commented by puissant last updated on 31/Oct/21

n!!! = n (n - 3) (n - 6) \dots .

Commented by MathsFan last updated on 31/Oct/21

okay \dots . understood sir

thanks