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Determină
2^n+2+2^n+1+2^n=14


Răspuns :

2^n+2 + 2^n+1 + 2^n = 14

2^n × ( 2^2 + 2^1 + 1) = 14

2^n × 7 = 14

2^n = 14 : 7

2^n = 2^1

n = 1