Question

How many 2 digit numbers are there, such that the units digit is strictly smaller than the tens digit?

Answer 1

➡HERE IS YOUR ANSWER⬇

For your the best clearance, let me write the numbers of two digits (such that the units digit is strictly smaller than the tens digit) :

10

20, 21

30, 31, 32

40, 41, 42, 43

50, 51, 52, 53, 54

60, 61, 62, 63, 64, 65

70, 71, 72, 73, 74, 75, 76

80, 81, 82, 83, 84, 85, 86, 87

90, 91, 92, 93, 94, 95, 96, 97, 98

Therefore, there are 45 numbers according to the given question.

⬆HOPE THIS HELPS YOU⬅