1.

A team 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 number of ways in which this can be done if two specified persons A,B should not included in the same group is

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A team 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 number of ways in which this can be done if two specified persons A,B should not included in the same group is



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