A fuse box contains 20 fuses of which 5 are defective. If 2 fuses are selected at random and removed from the box in succession without replacing the first, the possibility that both are defective.
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A fuse box contains 20 fuses of which 5 are defective. If 2 fuses are selected at random and removed from the box in succession without replacing the first, the possibility that both are defective.
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