There are 9 black and red stones of same size in a box. If you reach into the box with your eyes close, what is the minimum number of stones you must take out to be sure of having a pair that match?

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সঠিক উত্তর: 10। ব্যাখ্যা:

There are 9 black and red stones of same size in a box. If you reach into the box with your eyes close, what is the minimum number of stones you must take out to be sure of having a pair that match?

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