Alexis K.

asked • 02/02/16

Involving the selection of digits from a set... Select digits from the set {2,4,6,7,8,9} to form a number between 20 and 900...

Here's the whole problem and what it's asking:
Assume that you select digits from the set {2,4,6,7,8,9} to form a number between 20 and 900.

1.How many such numbers can be formed if digits are not repeated?
2.How many such numbers can be formed if digits can be repeated?
 
I started by treating it as a two part problem using the multiplication principle: the first part by finding the number of two digit numbers and the second part by finding the number of 3 digit numbers but I am not getting the correct answer. It's the very last problem I have and it's due at midnight. Any help would be appreciated, I am so lost.

2 Answers By Expert Tutors

By:

Deric D. answered • 02/02/16

Professional, Analytical and Creative Thinker Specializing in Math

Michael L. answered • 02/02/16

Intuitively explains the concepts in Math and Science

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