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[" A reserve of "12" railway station mas...

[" A reserve of "12" railway station masters is to "],[" be divided into two groups of "6" each one for "],[" day duty and the other for night duty.The "13" .Ther "],[" number of ways in which this can be done if "],[" two specified persons "A" ,"B" should not be "],[" included in the same group is "],[[" 1) "500," 2) "504," 3) "508],[" A committee of "," 3) "508," 4) "512]]

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