There are 20 marbles in a jar that are either red or blue. You are blindfolded and choose two marbles (without replacing or putting the first marble back in the jar). No matter how you choose, at least one marble is guaranteed to be blue. How many blue marbles are in the jar? (Hint: How many red marbles could there be?) Enter a number only.
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Answer:
There are 19 blue marbles.
Step-by-step explanation:
The only way to garuntee 1 marble out of 2 is blue, is if there was only 1 red marble.
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