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(i) 4 bulbs in a group of 20 bulbs are d...

(i) 4 bulbs in a group of 20 bulbs are defective. One bulb is drawn randomly from this group. What is the probability that this bulb will be defective? (ii) Suppose the bulb removed in (i) is not defective nor is it again mixed with the bulbs is. Now one of the remaining bulbs is taken out randomly. What is the probability that this bulb Won't spoil? (NCERT) A

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