How many different two-digit numbers can be formed from the digits 3, 1, 4, and 5 (allowing reuse)?
1 Answer
Aug 5, 2018
16
Explanation:
For each digit, we have 4 choices, and so that gives:
We can lay them out to verify:
33
31
34
35
13
11
14
15
43
41
44
45
53
51
54
55
