Question

Choose a natural number between 1 and 100, inclusive. What is the probability that the number chosen is not a multiple of 5? (Enter the probability as a fraction.)



Thank you it is appreciated.

Answer 1

I suspect they mean including 1 and 100 and not 2 through 99
so 100 numbers total

so 5, 10, 15 ...... 100 are multiples
How many?
10 * 2 = 20
20/100 = 1/5
so
1 - 1/5 = 4/5

Answer 2

1223