Question 655278
  <pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
Hi,
How many different 20 persons committee can be formed each containing at least 2 professors and atleast 3 associate professors 
from a set of 10 professors and 42 associate professors. {{{52}}} professors in all
   {{{52C20 - 10C1*42C19  - 10C0*42C20 }}}