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I could use some help on some math homework:
Two balls are drawn in succession out of a box containing 2 red and 5 white balls without replacement.
a) Find the probability that at least one ball was red
b) If the second ball is white, what is the probability that the first ball was white?
If you could work it out on a sheet of paper and post a pic that'd be best, I learn best from following steps. Thanks!
Pic unrelated
