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Question Number 126534 by mohammad17 last updated on 21/Dec/20

Commented by mohammad17 last updated on 21/Dec/20

$$??$$

Answered by mr W last updated on 21/Dec/20

$$1)$$$$C_3^{18}\times C_4^{15}\times C_6^{11}=514954080$$$$$$$$2)$$$$-M-C-T-$$$$3!\times P_3^4=144$$$$$$$$3)$$$$4^3-1=63$$

Answered by benjo_mathlover last updated on 22/Dec/20

$$\left(2\right)\underset{1^{st}}{-}\stackrel{E}{-}\underset{2^{nd}}{\stackrel{x}{-}}\stackrel{A}{-}\underset{3^{rd}}{\stackrel{x}{-}}\stackrel{O}{-}\underset{4^{th}}{-}=3!\times 3!\times \left(\begin{array}{c}4+1-1\\ 1\end{array}\right)$$$$=6\times 6\times 4=144$$

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