Puzzle Corner #5

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There are 3 jars, namely, A, B, C. All of them are mislabelled. Jar A contains red marbles, jar B contains blue marbles and Jar C contains red and blue marbles mixed in a random proportion. You can put your hand in a jar and pick only one at a time. Tell the minimum number of marble(s) that has/have to be picked in order to label the jars correctly.
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