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Permutation: n Different Things Taken r at a Time

Six boys and ...

Question

Six boys and six girls sit along a line alternately in $x$ ways ; and along a circle again alternatively in $y$ ways, then

A

x = y

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B

y = 12 x

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C

x = 10 y

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D

x = 12 y

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Solution

The correct option is B $x = 12 y$

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Permutation: n Different Things Taken r at a Time

Standard XII Mathematics

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