Question

How many different two digit numbers can be formed from the digits, 7,8, and 9 if the numbers must be even and no digit can be repeated?

Answer 1

Answer: Only two: 78 and 98

Step-by-step explanation: 8 is the only even number available to put in the units place where even or odd is determined. With no repetition allowed, the only possibilities left are to switch positions of the 7 and 9 in the tens place.

Answer 2

2

Explanation:

If the number must be even, the units digit must be 8. That leaves 2 choices for the tens digit. The possible numbers are ...

78

98

There are 2 of them.