Exactly one non-defective
A lot contains 15 items and 6 are defective. If two items are drawn at random from the lot, without replacement, what is the probability there is exactly one non-defective?
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An aluminum cup contains 225g of water and at 27 C. a 400-g sample of silver at an initial temperature of 87 C is placed in the water. a 40g copper stirre is used to stir the mixture until it reaches its final equlilbrium temperature of 32 C. Calc
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A concrete with a density of 2.35 g/cm^3 has a hydrogen content of 0.0085 weight fraction. What is the atom density of hydrogen in the concrete?
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