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
Correct Option: , 4
Solution:
