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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
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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