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Question Number 128874 by help last updated on 11/Jan/21

Commented by Ritu Jain last updated on 11/Jan/21

18

$$\mathrm{18} \\ $$

Answered by Olaf last updated on 11/Jan/21

16  Sorry 18 sir.

$$\mathrm{16} \\ $$$$\mathrm{Sorry}\:\mathrm{18}\:\mathrm{sir}. \\ $$

Commented by help last updated on 11/Jan/21

how?

Commented by mr W last updated on 11/Jan/21

C_2 ^4 ×C_1 ^3 =((4×3)/2)×3=18

$${C}_{\mathrm{2}} ^{\mathrm{4}} ×{C}_{\mathrm{1}} ^{\mathrm{3}} =\frac{\mathrm{4}×\mathrm{3}}{\mathrm{2}}×\mathrm{3}=\mathrm{18} \\ $$

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