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

$$5!!=?$$$$\mathrm{please}\mathrm{workings},\mathrm{how}\mathrm{is}\mathrm{the}\mathrm{answer}15$$

Answered by mrW1 last updated on 20/May/17

$$n!!=n\times (n-2)\times (n-4)\times ...\times 2or\times 1$$$$$$$$5!!=5\times 3\times 1=15$$

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

$$\mathrm{Now}\mathrm{i}\mathrm{understand}\mathrm{better}.\mathrm{God}\mathrm{bless}\mathrm{you}\mathrm{sir}.$$

Commented by RasheedSindhi last updated on 21/May/17

$$\mathrm{Is}\mathrm{there}\mathrm{any}\mathrm{definetion}\mathrm{for}$$$$\mathrm{n}!!!$$$$\mathrm{Perhaps}\mathrm{like}\mathrm{this}$$$$n!!!=n\times (n-3)\times (n-6)\times ...\times 3\mathrm{or}\times 2or\times 1$$$$$$

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