5-please-workings-how-is-the-answer-15-

Question Number 13508 by tawa tawa last updated on 20/May/17

5!! = ?

please workings, how is the answer 15

Answered by mrW1 last updated on 20/May/17

n!! = n \times (n - 2) \times (n - 4) \times \dots \times 2 o r \times 1

5!! = 5 \times 3 \times 1 = 15

Commented by tawa tawa last updated on 20/May/17

Now i understand better . God bless you sir .

Commented by RasheedSindhi last updated on 21/May/17

Is there any definetion for

n!!!

Perhaps like this

n!!! = n \times (n - 3) \times (n - 6) \times \dots \times 3 or \times 2 o r \times 1