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10, 13, 16, 19, 22, 25, 28......91, 94, 97
Ich suma to 1605
10+13+16+19+...97
Sn=(10+97)*30/2
Sn=(107)*15
S=1605
10, 13, 16, 19, 22, 25, 28......91, 94, 97
suma to 1605