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n=2•(1+2+3+....+99)-99​

Răspuns :

n = 2•(99 • 100 : 2) - 99

n = 2 • 99 • 50 - 99

n = 9900- 99

n = 9801

............................

n=2x(1+2+3+...+99)-99

2x(99x100/2)-99=

2x(99x50)-99=

2x4950-99=

9900-99=9801

n=9801