Indistinguishable 81481

How many ways can a tower of five yellow and four blue cubes be built so that each yellow cube is adjacent to at least one other yellow cube? Yellow dice are indistinguishable, and so are blue dice.

Correct answer:

n =  25

Step-by-step explanation:

ZZ(14)ZZZ ZZ(13)ZZZ ZZ(12)ZZZ ZZZZZ  ZZZ(4)ZZ ZZZ(3)ZZ ZZZ(2)ZZ ZZZZZ  ZZZZZ ZZZZZ ZZZZZ ZZZZZ ZZZZZ  n=2 (4+3+2+1)+5=25



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