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

माना \(3,6,9,12, \ldots 78\) पदों तक तथा \(5,9,13\), \(17, \ldots 59\) पदों तक दो श्रेणीयाँ है। तब दोनों श्रेढ़ीयों के उभयनिप्ठ पदों का योगफल है

  1. A \(2222\)
  2. B \(2223\)
  3. C \(2224\)
  4. D \(2225\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(2223\)

Step-by-step Solution

Detailed explanation

For series of common terms \(a =9, d =12, n =19\) \(S _{19}=\frac{19}{2}[2(9)+18(12)]=2223\)
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