[" (d) all of these "],[" 20.If there ar...

[" (d) all of these "],[" 20.If there are "6" girls and "5" boys who sit in a "],[" row,then the probability that no two boys "],[" sit together is "],[[" (a) "(6!)/(2!11!)," (b) "(7!5!)/(2!11!)],[" (c) "(6!7!)/(2!11!)," (d) none of these "],[1+4" o "1-p,1-2p]]

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