SOLUTION: Suppose we want to form three-digit numbers using the set of digits {0,1,2,3,4,5}. How many of these numbers are multiples of 5?
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Question 443816: Suppose we want to form three-digit numbers using the set of digits {0,1,2,3,4,5}. How many of these numbers are multiples of 5? Answer by edjones(8007) (Show Source):
You can put this solution on YOUR website! nPr=Permutation of n things taken r at a time.=n!/(n-r)!
6!/3! = 6*5*4 = 120 arrangements
2/6 = 1/3 of these end in 5 or 0.
120 * 1/3 = 40 of these numbers are multiples of 5.
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Ed
