Răspuns :
1+3+5+...+201
-------------------
201+199+197+...+1
201+201+201+...+201
2xS = 201x 200:2
S = 201x100 = 20100
-------------------
201+199+197+...+1
201+201+201+...+201
2xS = 201x 200:2
S = 201x100 = 20100