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29 April, 04:51

I have £1.88 in my pocket. All the coins are different. I take one out. What is the probability that I have taken out a 20p coin?

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  1. 29 April, 07:10
    0
    To get the answer for this, draw first a tree diagram.

    1 x £1

    1 x £0.50

    1 x £0.20

    1 x £0.10

    1 x £0.05

    1 x £0.02

    1 x £0.01

    = £1.88

    so probability of taking out a 20p coin is 1/7 for the first attempt.

    But if you have more than one attempt, still make a tree diagram so you can easily see the probabilities.
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