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JEE Mains · Maths · STD 11 - 6. permutation and combination

यदि \(a , b\) तथा \(c\) क्रमश: \({ }^{19} C _{ p },{ }^{20} C _{ q }\) तथा \({ }^{21} C _{ r }\) के अधिकतम मान हैं, तो

  1. A \(\frac{a}{11}=\frac{b}{22}=\frac{c}{21}\)
  2. B \(\frac{\mathrm{a}}{10}=\frac{\mathrm{b}}{11}=\frac{\mathrm{c}}{21}\)
  3. C \(\frac{\mathrm{a}}{10}=\frac{\mathrm{b}}{11}=\frac{\mathrm{c}}{42}\)
  4. D \(\frac{a}{11}=\frac{b}{22}=\frac{c}{42}\)
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Answer & Solution

Correct Answer

(D) \(\frac{a}{11}=\frac{b}{22}=\frac{c}{42}\)

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Detailed explanation

\(a=^{19} \mathrm{C}_{10}, \mathrm{b}=^{20} \mathrm{C}_{10}\) and \(\mathrm{c}= ^{21} \mathrm{C}_{10}\) \(\Rightarrow \mathrm{a}=^{19} \mathrm{C}_{9}, \mathrm{b}=2\left(^{19} \mathrm{C}_{9}\right)\) and \(\mathrm{c}=\frac{21}{11}\left(^{20} \mathrm{C}_{10}\right)\)…
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