Răspuns:
S2=2^25(25+1)/2
S2=2^25×26/2
S2=2^26×13
S2=2^338
S4=2^100×(100+1)/2
S4=2^100×101/2
S4=2^50×101
S4=2^5050
S6=3^10×(10+1)/2
S6=3^10×11/2
S6=3^5×11
S6=3^55
S8=3^2006(2006+1)/2
S8=3^2006×2007/2
S8=3^1003×2007
S8=2.013.021
S10=3^200(200+1)/2
S10=3^200×201/2
S10=3^100×201
S10=3^20100
S11=1+5^200(200+1)/2
S11=1+5^200×201/2
S11=1+5^100×201
S11=1+5^20100
Explicație pas cu pas:
^-ridicat la putere
iar acea suma ,e suma lui gauss
n(n+1)/2
iar /-totul supra
