Question

faceti suma toate numerelor naturale care sunt solutii ale inecuatiei : 

1+2+3......+2010+x mai mare sau egal decat 2021061

Answer 1

Facem Gauss
1+2+3+....+2010=2010*2011/2=1005*2011=2021055
2021055+x>=2021061
x>=2021061-2021055
x>=6
deci x = {6 +infinit}