Problem A box contains 5 defective and 195 non-defective cell phones. A quality control engineer selects 2 cell phones at random without replacement. What is the probability that exactly 1 is defective?

Answer Key

Solution

$P = 0.0490$

Another Solution $P = \dfrac{(^5C_1)(^{195}C_1)}{^{200}C_2}$

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