Five boys and five girls are to be seated in a row. in how many ways can they be seated if: (a) all boys must be seated in the five leftmost seals? (b) no two boys can be seated together? (c) john and mary must be seated together?
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p(a)=5
p( b)=5
p( c)=1
p( b)=5
p( c)=1
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