There are 5 books on Mathematics, 4 on physics. In how many ways these be placed on shelf if the books on the same subject are to be together ?

4592

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5760

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4800

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2672

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Solution

The correct option is B $5760$
Number of ways to arrange
mathematics books together $= 5!$
Number of ways to arrange
physics books together $= 4!$
$\Rightarrow$ Total no. of ways $= 5! \times 4! \times 2$
$= 5760$
2 ways to arrange math and physics
i.e $M P$
or $P M$

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There are 5 books on Mathematics, 4 on physics. In how many ways these be placed on shelf if the books on the same subject are to be together ?

The correct option is B 5760Number of ways to arrange mathematics books together=5!Number of ways to arrange physics books together=4!⇒ Total no. of ways=5!×4!×2=57602 ways to arrange math and physicsi.e M Por P M

The correct option is B $5760$
Number of ways to arrange
mathematics books together $= 5!$
Number of ways to arrange
physics books together $= 4!$
$\Rightarrow$ Total no. of ways $= 5! \times 4! \times 2$
$= 5760$
2 ways to arrange math and physics
i.e $M P$
or $P M$