# MATHS

This bank machine has four rows of buttons

1 2 3
4 5 6
7 8 9
0

Sam has a 4-digit bank number that uses one button from each row. For example his bank number could be 0571.
How many different possibilities for Sam's bank number are there?

1. 👍 0
2. 👎 0
3. 👁 274
1. 3 choices on each row except the last, so
3*3*3*1

That gives the number of digit choices. Now, for each choice of 4 digits, there are 4! ways to arrange them, so the final tally is

3*3*3*1*4!

1. 👍 0
2. 👎 0

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