Question

Which numbers are multiples of /?
6 Here are 10 digit cards,
5
Use the cards to make five two digit numbers that are multiples of 3.
You can use each card only once
P
?
?
?
?
?
?

Answer 1

Answer:

In the first option, there are 5! = 120 ways to form a five-digit number that is divisible by 3. In the second option, however, since 0 can't be the first digit, there are only 4 x 4 x 3 x 2 x 1 = 96 ways to form a five-digit number that is divisible by 3.