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Calculati : 2 la puterea 0 + 2 la puterea 1 +..... + 2 la puterea 1997

Răspuns :

S=2^0+2^1+....+2^1997
2S=2^1+2^2+...+2^1997+2^1998
2S-S=2^1998-2^0
S=2^1998-2^0
S=2^1998-1