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

નીચેની ત્રણ સમાંતર શ્રેણીઓ \(3,7,11,15,...................,399\) \(2,5,8,11,............,359\) અને \(2,7,12,17,...........,197\), ના સામાન્ય પદોનો સરવાળો \(.....\) છે.

  1. A \(322\)
  2. B \(321\)
  3. C \(324\)
  4. D \(328\)
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Answer & Solution

Correct Answer

(B) \(321\)

Step-by-step Solution

Detailed explanation

\(3,7,11,15, \ldots \ldots \ldots \ldots, 399 \quad d_1=4\) \(2,5,8,11, \ldots \ldots \ldots \ldots ., 359 \quad d_2=3\) \(2,7,12,17, \ldots \ldots ., 197 \quad d_3=5\) \(\operatorname{LCM}\left(d_1, d_2, d_3\right)=60\) Common terms are \(47, 107, 167\) \(Sum =321\)
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