Arithmetic Ability
 Probability

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Q.

A number is selected at random from the numbers 1 to 30. What is the probability that it is divisible by either 3 or 7 ?

View Answer

Correct choice: A

Explanation:

Let A be event of selecting a number divisible by 3. B be the event of selecting a number divisible by 7. Proability tutorial A = { 3, 6, 9, 12, 15, 18, 21, 24, 27, 30 }, so n(A)=10 B = { 7, 14, 21, 28 }, n(B)= 4
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