+612 Given the four digits 2, 4, 6, and 7, how many different positive two-digit integers can be formed using these digits if a digit may not be repeated in an integer?
+37146 4*3 =12
First digit second digit
2 4, 6, 7
4 6, 7, 2
6 7, 2, 4
7 2, 4, 6
