In how many ways can five examination papers be arranged so that … - Vidyadip

Question

In how many ways can five examination papers be arranged so that physics and chemistry papers never come together

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Answer

d
(d) Total arrangements of $5$ papers are $ = 5\;! = 120$

When physics and chemistry come together $ = 4\;!\; \times 2\;! = 48$

Hence required number of ways are $120 - 48 = 72$.

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