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JEE Mains · Maths · STD 11 - 8. sequence and series

समुच्चय \(\{ n \in\{1,2, \ldots, 100\} \mid n\) तथा \(2040\) का महत्तम समापवर्तक \(1\) है \(\}\) के सभी अवयवों का योग बराबर है ................ ।

  1. A \(1251\)
  2. B \(1300\)
  3. C \(1456\)
  4. D \(1371\)
Verified Solution

Answer & Solution

Correct Answer

(A) \(1251\)

Step-by-step Solution

Detailed explanation

\(2040=2^{3} \times 3 \times 5 \times 17\) \(n\) should not be multiple of \(2,3,5\) and \(17 .\) Sum of all \(n=(1+3+5 \ldots . .+99)-(3+9+15+21+\ldots . .+99)-(5+25+35+55+65\) \(+85+95)-(17)\) \(=2500-\frac{17}{2}(3+99)-365-17\) \(=2500-867-365-17=1251\)
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