Question

How many three-digit even numbers can be formed using digits from the set {1, 2, 3, 4, 5, 6, 7}
a. if no digit can be repeated in any one number?

Answer 1

The unit numbers can be 2,4,6.Suppose 2 as the unit number we can form 20 numbers the same way for 4 and 6 so totally 60 numbers.