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

જો \(a, b\) અને \(c\) એ અનુક્રમે \(^{19} \mathrm{C}_{\mathrm{p}},^{20} \mathrm{C}_{\mathrm{q}}\) અને \(^{21 }\mathrm{C}_{\mathrm{r}}\) ની મહતમ કિમંતો હોય તો . . .  

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

Answer & Solution

Correct Answer

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

Step-by-step Solution

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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