posted by Frank

If no digit may be used more than once, how many 2-digit numbers can be formed using only the digits 5, 6, 3, and 2?

11
12
10
2

1. Ms. Sue

56
53
52
65
35
25
63
62
36
26
23
32

Did I list all of the possibilities?

2. Reiny

There are 4 digits to fill 2 spaces
number = (4)(3) = 12

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