permutations or combinations ?

Algebra
Tutor: None Selected Time limit: 1 Day

How many 3-digit numbers are possible using only the digits 0,1,4,5,7, and 9 without repeats? 

Oct 12th, 2015

Note the permutations formula, where:

Here n=6 and k=3, meaning

P(6,3)=6!/(6-3)!

P(6,3)=6!/(3)!

Answer: P(6,3)=120

Oct 12th, 2015

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Oct 12th, 2015
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Oct 12th, 2015
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