in 2 digit numbers, how many 10th place digit numbers are greater then unit place digit?
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Two digit numbers are from 10 to 99. Let us try to find some pattern.
90 to 99 no units digit is more than tens digit.
80 to 89 only in 89 units digit is more than tens digit.
70 to 79 here you have two numbers satisfying the condition 78 and 79
60 to 69 here you have three numbers 67, 68, 69 now we found a pattern
50 to 59———- 4 numbers
40 to 49 ———5 numbers
30 to 39———-6 numbers
20 to 29———-7 numbers
10 to 19————8 numbers. Now let us count them altogether 36.
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