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You have two red and two blue blocks. How many different towers can you build that are four blocks high using these blocks?

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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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6 Possibilities,

R-B-R-B

R-R-B-B

B-R-R-B

B-R-B-R

B-B-R-R

R-B-B-R

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