Question

A bag contains 20 balls marked 1 to 20. one ball is drawn at random. find the probability that it is marked with a number multiple of 5 or 7.

Answer 1

hi friend
here's your answer looking for

to find the probability first we have to find the multiple of 5 and 7 between 1 to 20.

so,
multiple of 5 = 5,10,15,20
and
multiple of 7 = 7, 14

so, the total number of possible outcome = 6

hence, probability =

$\frac{6}{20} \\ \\ = \frac{3}{10}$
so, this is your answer

hope you are satisfied with my answer