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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

$$OOOXX\Rightarrow 2$$$$OOOXY\Rightarrow 2\times C_2^4=12$$$$totally:2+12=14$$

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