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calculati : 3+6+9+12+.....+300=????

Răspuns :

3 + 6 + 9 + 12 + ..... + 300 = 
3(1 + 2 + 3 + 4 +.......+ 100) =
3 * 100 * 101 : 2 =
3 * 101 * 50 =
15 150 
3x100x101/2=150x101=15150