Question

How many four- digit numbers can be formed from the digit 1,3,4,5,6&7 where the digit is used at most once?( repetition are not allowed)

a)if the number must be odd
b)if the number must be even​

Answer 1

A. 24

B. I don't think you can make any since you can't repeat numbers and there is only two even numbers

Also, if you use all six numbers, it's 120 combos