Răspuns:
5060
Explicație pas cu pas:
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abc : 15 = c₁ + 11
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abc : 30 = c₂ + 11
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abc : 45 = c₃ + 11
15 = 3 · 5 ; 30 = 2·3·5 ; 45 = 3²·5 =>
cmmmc ( 15 ; 30 ; 45) = 3²·2·5 = 90 =>
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abc : 90 = x + 11
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x = 1 => abc = 101
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x = 2 => abc = 191
..................................
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x = 10 => abc = 911
Suma = 101+191+.............+911 = (101+911)·10:2 = 1012·5 = 5060
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