How many two-digit prime numbers can be formed by choosing two different digits from the set {2, 7, 8, 9} to be used as the tens digit and units digit?
There are 12 two-digit prime numbers that can be formed by choosing two different digits from the set {2, 7, 8, 9} to be used as the tens digit and units digit.
The two-digit prime numbers that can be formed are:
- 23
- 29
- 37
- 79
- 83
- 89