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

$$\mathrm{what}\mathrm{is}\mathrm{the}\mathrm{value}\mathrm{of}$$$$9!!$$

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

$$\mathrm{please}\mathrm{how}$$

Commented by puissant last updated on 30/Oct/21

$$n!!=n(n-2)(n-4)....$$

Commented by MathsFan last updated on 31/Oct/21

$$\mathrm{thanks}$$

Commented by MathsFan last updated on 31/Oct/21

$$\mathrm{sir},\mathrm{what}\mathrm{about}n!!!$$

Commented by puissant last updated on 31/Oct/21

$$n!!!=n(n-3)(n-6)....$$

Commented by MathsFan last updated on 31/Oct/21

$$\mathrm{okay}....\mathrm{understood}\mathrm{sir}$$$$\mathrm{thanks}$$

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