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

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\(10^{\text {th }}\) पंक्ति के सभी पदों का योग .......... है।

  1. A \(1505\)
  2. B \(1078\)
  3. C \(1045\)
  4. D \(1548\)
Verified Solution

Answer & Solution

Correct Answer

(A) \(1505\)

Step-by-step Solution

Detailed explanation

\( 2,5,11,20, \ldots . . \) \( \text { General term }=\frac{3 n^2-3 n+4}{2} \) \( \mathrm{T}_{10}=\frac{3(100)-3(10)+4}{2} \) \(=137 \) \( 10 \text { terms with c.d. }=3\) sum \( =\frac{10}{2}(2(137)+9(3))\) \( =1505\)
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