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S=2+4+6........+100=


Răspuns :

S = 2 + 4 + 6 + ... + 100

S = 2 × ( 50 × 51 : 2 )

S = 2 × ( 2550 : 2 )

S = 2 × 1275

S = 2550

Răspuns:

suma lui Gauss

2+.....+100=1+[(100+1)·100]:2=5050-1=5049