if choosing one number from 0 to 100 randomly.

Question

find the probability that a number chosen is of last digit is greater than first digit of two number

Answer 1

take a look:
12 ... 19: 8
23 ... 29: 7
...
89: 1
so there are 1+2+3...+8 = 8*9/2 = 36

Answer 2

so P = 36/101

Answer 3

I didn't understand dear