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afla pe y=1+2+2 la puterea a 2 +2la puterea 3+...+2 la puterea 3774

Răspuns :

adaugam si scadem 1
y=1+1+2+2²+2³+...+2^3774-1=
=2+2+2²+2³+.....+2^3774-1=
=2²+2²+2³+....+2^3774-1=
=2·2²+2³+....+2^3774-1=
=2³+2³+.....+2^3774-1=
.................................
=2^3774+2^3774-1=
=2^3775-1