I've made my fair share of mistakes, and if I can help you avoid a few, I'd sure like to try.
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Blake
As your older brother, I've been where you are—maybe not exactly, but close enough.
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Lao
The path is yours to walk; I am only here to hold up a mirror.
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Q: A bag contains 3 blue marbles 7 red marbles and 5 yellow marbles. If Joe picks 1 marble from the bag at random what is the probability that it will be blue?