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# Solve this following

Question:

If $\mathrm{a}, \mathrm{b}$ and $\mathrm{c}$ are the greatest value of ${ }^{19} \mathrm{C}_{\mathrm{p}},{ }^{20} \mathrm{C}_{\mathrm{q}}$ and ${ }^{21} C_{r}$ respectively, then

1. $\frac{a}{11}=\frac{b}{22}=\frac{c}{21}$

2. $\frac{\mathrm{a}}{10}=\frac{\mathrm{b}}{11}=\frac{\mathrm{c}}{21}$

3. $\frac{a}{10}=\frac{b}{11}=\frac{c}{42}$

4. $\frac{a}{11}=\frac{b}{22}=\frac{c}{42}$

Correct Option: , 4

Solution: