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Please show formula and all steps Emily has a 18 marbles in her backpack. Seven of them are yellow, the rest are green. Every day

Please show formula and all steps

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Emily has a 18 marbles in her backpack. Seven of them are yellow, the rest are green. Every day after school she randomly takes out 5 marbles and challenges Amanda to a game. a) What is the probability that Emily will select exactly 3 yellow marbles? b) Determine the expected number of green marbles.

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