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A box contains three types of rings. Four square rings, three circular rings and three hexagonal rings. 3 rings are drawn randomly. What is the probability that rings drawn contain 2 square rings?

A box contains three types of rings. Four square rings, three circular rings and three hexagonal rings. 3 rings are drawn randomly. What is the probability that rings drawn contain 2 square rings? Correct Answer 0.3

GIVEN:

Total number of rings: 10

FORMULA USED:

P(E) = no. of favorable outcomes/total number of outcomes

CALCULATION:

Let ‘E’ is an event of favorable outcomes.

Number of favorable outcomes = 4C2 × 6C1 ⇒ 36

Total number of outcomes = 10C3 ⇒ 120

∴ P(E) = 36/120 ⇒ 3/10

⇒ 0.3

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