Calculate the probability, giving your final answers in fraction form, of: a) Choosing a red marble from a jar containing 5 green marbles, 7 red marbles and 3 blue marbles. b) Defective components if a company produces 500 components, tests 175 of them and finds out that 14 of the tested components are defective. c) Picking a black ace from a pack of 52 cards, assuming there are no jokers.

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