John’s piggy bank contained 7 dimes and 3 quarters. he pulled out 1 coin without looking. without replacing the first coin, john then pulled out a second coin. what is the probability that both coins were dimes? express your answer in simplest form. as a fraction

To do this, make a probability tree. The second set of branches are out of 9 as the coin is not replaced. Multiply along the lines in order to work out the probabilities; in a test, multiply along all the lines - even if they are not needed - to ensure full marks. As a check, add up the final values, they should equal 1.

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