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JEE MainMathematicsEasy / Moderate/ ToughBinomial Theorem

If [IMAGE] then k equals

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[IMAGE] Now, [IMAGE] Let given sum be S, so
Given, S=k21⇒k=100S = \frac{k}{21} \Rightarrow k = 100


Source: Grass-G / M-22 Mathematics Paper 19 Dec Eng.docx

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