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Rezultatul calcului 1+5+9+.......+41 este:

a)56
b)231
c)210
d)100

Răspuns :

Stoicaeliza6
1+5+9+13+17+21+25+29+33+37+41=
6+9+13+17+21+25+29+33+37+41=
15+13+17+21+25+29+33+37+41=
28+17+21+25+29+33+37+41=
45+21+25+29+33+37+41=
66+25+29+33+37+41=
91+29+33+37+41=
120+33+37+41=
153+37+41=
190+41=231
b)231

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