Problem
COM-B1-M01-P003 Two-Digit Numbers
#3
★☆☆☆☆ Level 1 of 5
How many two-digit numbers with distinct digits can be formed from \(1,2,3,4,5\)?
There are \(5\) choices for the tens digit, then \(4\) for the units digit.
The tens digit has \(5\) choices, and the units digit has \(4\) choices. Total: \(5\cdot4=20\).
Shows dependence of the second step.