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

यदि \(b _{1}, b _{2}, b _{3}, \ldots b _{11}\) एक वर्धमान \(A.P.\) है और इसके पदों का प्रसरण \(90\) है, तो इस \(A.P.\) का सार्व अन्तर है

  1. A \(3\)
  2. B \(9\)
  3. C \(-9\)
  4. D \(-3\)
Verified Solution

Answer & Solution

Correct Answer

(A) \(3\)

Step-by-step Solution

Detailed explanation

Let a be the first term and \(d\) be the common difference of the given A.P. Where \(d>0\) \(\overline{ X }= a +\frac{0+ d +2 d +\ldots+10 d }{11}\) \(=a+5 d\) \(\Rightarrow\) varience \(=\frac{\Sigma\left(\bar{X}-x_{i}\right)^{2}}{11}\)…
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