Question

A number is chosen at random from the set (2,4,6,................18,20). Find the probability that it is either a factor of 18 or a multiple of 5. A. 1/4 B. 1/2 C. 1/3 D. 2 E. 1/8

Answer 1

B. 1/2

Explanation:

We must take into account the specific outcomes and the total to determine the probability, as follows:

Factor of 18: 2, 6, 18 (3 outcomes)

Multiple of 5: 10, 20 (2 outcomes)

In total there are 10 data, therefore:

`p=(2+3)/(10)=(5)/(10)=(1)/(2)`

Therefore, the correct answer is B. 1/2