A shopkeeper has 100 memory cards in a box. Among them, 15 memory cards are defective. When a person came to the shop to buy a memory card, the shopkeeper drew a memory card at random from the box. Then, i) what is the probability that this memory card is defective ? ii) after drawing the first memory card which is defective, it is not placed back in the box. Then an- other memory card is drawn at random. What is the probability that this memory card is NOT de- fective ?
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p(getting defected memory card) = 15/100 = 3/20
p(getting not defected memory card) = 85/100 = 17/20
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