Question

a bag contains 30 balls numbered from 1 to 30 one ball is drawn at random what is the probability that the number of the balls is a multiple of 5 and 6

Answer 1

total no. of possible outcomes = 30

favourable outcomes=5+4

= 9

probability = total possible outcomes/favourable outcomes

=30/9

Answer 2

Answer:

Step-by-step explanation:

Total no. Of balls 30

Multiple of 5less than 30 case1

=5, 10,15,20,25,30

Multiple of 6less than 30

=6, 12,18,24,30 case2

As 30 is common in both cases,

We will consider Only one 30

Total no of outcome as multiple of 5&6

=6 in case. 1 & 5 in case 2(but only one 30 is considered)

So, 11-1=10

Probability of multiple of 5 & 6=10/30

=1/3 or 0.33