### Instruction: If a number between 10 and 40 (inclusive) at random. What is the probability that the tens digit is greater than ones digit?
Answer Choices: (A) 31/41 (B) 1041 (C) 7/31 (D) 27/41 (E) 11/41.### Response: Let's think about the multi-choice question.
If tens digi is 4 ---> ones digit : 0
If tens digi is 3 ---> ones digit : 0, 1, 2
If tens digi is 2 ---> ones digit : 0, 1
If tens digi is 1 ---> ones digit : 0
So the number of numbers whose tens digit is greater than ones digit is 11.
The total number is 40-10+1=31.
So the probability is 7/31.
The answer is C.