Previous in Permutation and Combination Next in Permutation and Combination | ||
Question Number 198022 by cortano12 last updated on 08/Oct/23 | ||
$$\:\:\mathrm{Five}\:\mathrm{letters}\:\mathrm{are}\:\mathrm{selected}\:\mathrm{from} \\ $$ | ||
Answered by mr W last updated on 08/Oct/23 | ||
$${OOOXX}\:\:\Rightarrow\mathrm{2} \\ $$$${OOOXY}\:\:\Rightarrow\mathrm{2}×{C}_{\mathrm{2}} ^{\mathrm{4}} =\mathrm{12} \\ $$$${totally}:\:\mathrm{2}+\mathrm{12}=\mathrm{14} \\ $$ | ||