A crate holds 9 working bulbs and 3 defective bulbs. If one bulb is picked at random, what is the probability it is defective?
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Correct!
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Correct answer to question 210 (Arithmetic Reasoning): 1/4
Method
Probability is defective bulbs over total bulbs. There are 3 defective out of 9 + 3 = 12 bulbs, and 3/12 simplifies to 1/4.
Updated: November 2026
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