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Source: GMAT Paper Tests
A box contains 10 light bulbs, fewer than half of which are defective. Two bulbs are drawn simultaneously from the box. If n of the bulbs in the box are defective, what is the value of n?
1) The probability that the two bulbs to be drawn will be defective is \(\dfrac{1}{15}\)
2) The probability that one of the bulbs to be drawn will be defective and the other will not be defective is \(\dfrac{7}{15}\)
The OA is D
A box contains 10 light bulbs, fewer than half of which are defective. Two bulbs are drawn simultaneously from the box. If n of the bulbs in the box are defective, what is the value of n?
1) The probability that the two bulbs to be drawn will be defective is \(\dfrac{1}{15}\)
2) The probability that one of the bulbs to be drawn will be defective and the other will not be defective is \(\dfrac{7}{15}\)
The OA is D
