Răspuns:
2^10(10+1)/2
2^10×11/2
2^5×11
2^55
2^50×(50+1)/2
2^50×51/2
2^25×51
2^1275
4^10(10+1)/2
4/10×11/2
4^5×11
4^55
5^100×(100+1)/2
5^100×101/2
5^50×101
=5^5050
2^2013(2013+1)/2
2^2013×2013/2
2^2013×1007
2^2.027.091
2^0=1
deoarece e 0,nici un termen nu e valid
deci,2^0=1 mereu
chiar daca faci 2^0(0+1)/2
da 2^0×1/2
ce e 2^0/2*2^0:2,0:2 fiind 0)
ce e 2^0
egal cu 1
