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I : theunmberof waysof arranging4 boy and3girlsina rowalwaysbeginswitha boy endswitha girlsis 1440 . II: Thenumberof waysof arranging5 boyand 4girlsin a lineso thattherewill be aboy inthe begingand in theendingand intheendingis 10080 |
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Answer» Only1 is ture |
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