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The second probability can change - Paper 1

Read the information, then answer the questions. An adult may read the instructions aloud. Show your working where asked.

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Bag model: 3 red and 5 blue counters, otherwise identical. Draw two uniformly at random WITHOUT replacement. The second total is 7, and the selected colour count drops by one. Use ordered routes RR, RB, BR, BB; RB and BR are distinct routes to different colours.

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