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

दो समान्तर श्रेणीयों \(3,7,11, \ldots .407\) एवं \(2,9,16, \ldots .709\) में उभयनिष्ठ पदों की संख्या है।

  1. A \(20\)
  2. B \(17\)
  3. C \(11\)
  4. D \(14\)
Verified Solution

Answer & Solution

Correct Answer

(D) \(14\)

Step-by-step Solution

Detailed explanation

Common term are : \(23,51,79, \ldots . . T_{n }\) \(\mathrm{T}_{\mathrm{n}} \leq 407 \quad \Rightarrow 23+(\mathrm{n}-1) 28 \leq 407\) \(\Rightarrow n \leq 14.71\) \(\mathrm{n}=14\)
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