http://web2.0calc.com/questions/the-positive-three-digit-integer-n-has-a-ones-digit-of-0-what-is-the-probability-that-n-is-divisible-by-4-express-your-answer-as-a
+23254 Since the last digit is a zero, let's focus on the first two digits -- they will go from 10 through 99
First: count how many numbers there are from 10 through 99. (Answer to part A)
For the whole number to be divisible by 4 and since the last number is a zero, it will already be divisible by 2.
The problem now becomes: how many of the numbers from 10 through 99 are divisible by 2; or, in other words, how many of the number from 10 through 99 are even? (Answer to part B)
Divide the answer to part B by the answer to part A to get the probability ...
+23254 Since the last digit is a zero, let's focus on the first two digits -- they will go from 10 through 99
First: count how many numbers there are from 10 through 99. (Answer to part A)
For the whole number to be divisible by 4 and since the last number is a zero, it will already be divisible by 2.
The problem now becomes: how many of the numbers from 10 through 99 are divisible by 2; or, in other words, how many of the number from 10 through 99 are even? (Answer to part B)
Divide the answer to part B by the answer to part A to get the probability ...
