a number is chosen at random from the interger 10 to 30 inclusive what is the probability that it is a multiple of 3, a multiple of 5, prime number , perfect square

Answer 1

For each part, find how many numbers have the stated characteristic, then divide by 21.
e.g. multiples of 5:
these would be 10, 15, 20, 25, and 30
so prob(a multiple of 5 ) = 5/21

Do the others the same way

Answer 2

A number is chosen at random from the integers 10 to 30 inclusive.find the probability that number is prime

Answer 3

Answer

Answer 4

Okay