You can put this solution on YOUR website! Hi,
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*Note: The number of permutations of n distinct objects taken r at a time, where repetitions are not allowed is n!/(n-r)!
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n!/(n-r)!
In this case 5 types of flowers taken 3 at a time
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5!/2! =( 5*4*3*2*1)/2*1 = 5*4*3 = 60
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60 vases