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4 October, 22:40

There are 15 marbles in a bag; 10 are blue, 4 are red and 1 is green. Marbles are drawn and NOT replaced 8 times, with the number of red marbles being recorded. What is the probability of getting exactly 3 red marbles? (Write as a percentage, correct to two decimals. eg: 12.34%)

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  1. 4 October, 22:46
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    Answer: There is a 0.88% chance of pulling three red marbles in a row.

    Step-by-step explanation:

    First pull = 4/15 (26.67%)

    second pull = 3/14 (21.43%)

    Third pull = 2/13 (15.38%)

    You need to multiply these three fractions to get the probability of pulling three reds in a row, doing that will get you 4/455 or 0.88%
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