Q.

8 boys and 4 girls sit in a row at random. The probability that all the girls sit  together is

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a

155

b

328

c

127

d

751

answer is A.

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Detailed Solution

8 Boys  + 4Girls⇒n(S)=12! n(A)=9!.4!P(A)=n(A)n(S)=9!.4!12!=155
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