Question 145
Pedrinho makes a list of all the 5 different digit numbers that form with the digits $1,2,3,4,5$. In this list, the numbers are sorted in an increasing manner.
a) Which number ranks 10th in the list?
b) What number 85 on the list?
a) Which number ranks 10th in the list?
b) What number 85 on the list?