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Question
What is the probability that a two digit number selected at random will be a multiple of '3' and not a multiple of '5'?
What is the probability that a two digit number selected at random will be a multiple of '3' and not a multiple of '5'?
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Solution
The correct option is B
Option (b)
Sample space is 90 numbers, of which , 
= 30 are multiples of 3. 90/5= 18 are multiples of 5, of which every 1 out of 3 are multiples of both 3 and 5.
Probability that a two-digit number is a multiple of 3 and not a multiple of 5 = 30-6 = 
=
Option (b)
Sample space is 90 numbers, of which , = 30 are multiples of 3. 90/5= 18 are multiples of 5, of which every 1 out of 3 are multiples of both 3 and 5.
Probability that a two-digit number is a multiple of 3 and not a multiple of 5 = 30-6 = =
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