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Need help with this math question, not sure how to do the equation and solve it, reference photo In a box of 20 light bulbs,

Need help with this math question, not sure how to do the equation and solve it, reference photo

In a box of 20 light bulbs, 4 are known to be defective. If 3 bulbs are selected at random, find the probability that at least one of the bulbs are defective

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