13. 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?
b. 280
d. 312
a. 212
c. 272
e. 266
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Answer:
sorry I don't know the answer..
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