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Because of a mistake in packaging, 5 defective electric toothbrushwere packaged with 15 good ones ( a total of 20 ). Alltoothbrusheslook alike and have

Because of a mistake in packaging, 5 defective electric toothbrushwere packaged with 15 good ones ( a total of 20 ). Alltoothbrusheslook alike and have equal probability of being chosen. Threetoothbrushare selected randomly. What is the probability that all 3 are defective?

a) 1/52

b) 9/1140

c) 1/114

d) 15/114

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