SOLUTION: how many 6 number combinations will be made from 1 2 3 4 5 6 7 8 9, where 1 2 and 3 must appear on the 6-number combination?
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Question 26342: how many 6 number combinations will be made from 1 2 3 4 5 6 7 8 9, where 1 2 and 3 must appear on the 6-number combination? Answer by venugopalramana(3286) (Show Source):
You can put this solution on YOUR website! 1,2 AND 3 MUST APPEAR IN THE COMBINATION.
SO WE NEED TO SELECT ANOTHER 3 NUMBERS ONLY OUT OF REMAINING 6 NUMBERS WHICH CAN BE DONE IN 6C3 WAYS
6C3=6*5*4/(3*2*1)=20
