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Answer: 59/90

 Aug 3, 2019
 #1
avatar+6045 
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this is just a counting problem, nothing particularly clever about it.

 

you can do this one.

 Aug 3, 2019
 #2
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(10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 24, 25, 26, 28, 30, 31, 32, 33, 35, 36, 39, 40, 41, 42, 44, 45, 48, 50, 51, 52, 55, 60, 61, 62, 63, 64, 65, 66, 70, 71, 72, 75, 77, 80, 81, 82, 84, 85, 88, 90, 91, 92, 93, 95, 96, 99) = 59 Numbers
There are: 99 - 10 + 1 = 90 2-digit numbers.
The probability = 59 / 90

 Aug 3, 2019

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