Вычислите сумму, используя «прием Гаусса»:
А) 1 + 2 + 3 + … + 50;
Б) 11 + 12 + 13 + … + 60;
В) 1 + 3 + 5 + …+ 99;
Г) 3 + 6 + 9 + …+ 90
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