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Q.

6 boys and 6 girls sit along a line alternately in x  ways; and along circle again alternatively in y ways, then

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a

x=y

b

y=12x

c

x=10y

d

x=12y

answer is D.

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Detailed Solution

x=  2!   6!   6! y=   5!   6!x= (5!   6!)(2×6)∴  x=12y .
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