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Question Number 90221 by zainal tanjung last updated on 22/Apr/20

$$\mathrm{There}\mathrm{are}3\mathrm{copies}\mathrm{each}\mathrm{of}4\mathrm{different}$$$$\mathrm{books}.\mathrm{The}\mathrm{number}\mathrm{of}\mathrm{ways}\mathrm{in}\mathrm{which}$$$$\mathrm{in}\mathrm{which}\mathrm{they}\mathrm{can}\mathrm{be}\mathrm{arranged}\mathrm{in}\mathrm{a}$$$$\mathrm{shelf}\mathrm{is}$$

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