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

माना \(3,7,11,15, \ldots, 403\) और \(2,5,8,11, \ldots, 404\) दो समांतर श्रेणियाँ हैं। तो उनमें उभयनिष्ठ पदों का योग ........... है।

  1. A \(6696\)
  2. B \(6697\)
  3. C \(668\)
  4. D \(6699\)
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Answer & Solution

Correct Answer

(D) \(6699\)

Step-by-step Solution

Detailed explanation

\(3,7,11,15, \ldots ., 403\) \(2,5,8,11, \ldots ., 404\) \(\operatorname{LCM}(4,3)=12\) \(11,23,35, \ldots . \text { माना }(403)\) \(403=11+(n-1) \times 12\) \(\frac{392}{12}=n-1\) \(33 \cdot 66=n\) \(n=33\) \(\text{योग} \frac{33}{2}(22+32 \times 12)\) \(=6699\)
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