among 10 laptop 5 are good and 5 have defects .unaware of this a customer buys 6 laptops
(a) what is the probability that exactly two of them are defective
(b)given that atleast 2 purchases laptops are defective,what is the probability that exactly 2 are defective?

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(a) : 0.32

could plz explain it step by step ? thanks

5/10x4/9x3/8x2/7x5/6x4x5

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