Problem
COM-B1-M01-P018 Increasing Digits
#18
★★★☆☆ Level 3 of 5
How many three-digit numbers have strictly increasing nonzero digits?
Choose three digits; then the order is determined.
Choose any \(3\) digits from \(1,2,\ldots,9\). After choosing them, there is exactly one increasing order. There are \(84\) such choices.
Shows when order does not multiply the answer.