In how many ways 7 pictures can be hanged on 9 pegs ? Ans. is ( 9! / 2 ! )
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Ans is 9C7 *7!
U can SELECT 7pics on 9pegs in 9C7 ways and ARRANGE these pics. in 7! ways.
U can SELECT 7pics on 9pegs in 9C7 ways and ARRANGE these pics. in 7! ways.
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