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प्रश्न
You have two red and two blue blocks. How many different towers can you build that are four blocks high using these blocks? List all the possibilities
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उत्तर
Listing all possible towers
R – B – R – B
R – R – B – B
B – R – R – B
B – R – R – B
B – B – R – R
R – B – B – R
So we have 6 possibilities.
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