Answered

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?

Answer :

shinmin

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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