# 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