Question 820396
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Hi,
In an examination 10 questions are to be answered choosing at least 4 from each of part A and part B. 
If there are 6 questions in part A and 7 in part B,
in how many ways can 10 questions be answered ?
   (6C4)(7C4)  2 remaining questions to be answered (0,1,2) from part A, rest from part B
in how many ways can 10 questions be answered ?
  {{{ (6C4)(7C6)+ (6C5)(7C5) + (6C6)(7C4)}}}