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Q.

If 5 boys and 4 girls are arranged in a row at random then the probability of arranging so that same sex do not come together is

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a

11126

b

1126

c

1125

d

7126

answer is B.

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Detailed Solution

The probability of arranging so that same sex do not come together is P(E)=4!5!9!=1126
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If 5 boys and 4 girls are arranged in a row at random then the probability of arranging so that same sex do not come together is