Suppose that in a production of spark plugs the fraction of defective plugs has been constant at

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Suppose that in a production of spark plugs the fraction of defective plugs has been constant at over a long time and that this process is controlled every half hour by drawing and inspecting two just produced. Find the probabilities of getting

(a) No defectives

(b) 1 defective

(c) 2 defectives. What is the sum of these probabilities?

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