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1+5+9+...+201 calculat cu suma lui Gauss

Răspuns :

1+5+9...+201

Calculam numarul termenilor:
1=4*0+1
5=4*1+1
9=4*2+1

201=4*50+1

51 de termeni

S=51*202:2
S=51*101
S=5151