Combination question when there are 2 requirements

Mathematics
Tutor: None Selected Time limit: 1 Day

If a student picks 5 questions from a 7 question exam, there are 21 ways to pick them (7C5).  However, if they are required to answer the 1st and 7th question, then how many ways are there to pick?  

May 22nd, 2015

Please clarify if you have to answer 3 more questions in addition to 1 and 7.......................................................................

May 22nd, 2015

I assume that you have to answer the additional questions.

So the no: of ways will be  5C3 = 10 ways

Please let me know if you have any questions and best me if you are satisfactory.


May 22nd, 2015

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May 22nd, 2015
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May 22nd, 2015
Dec 3rd, 2016
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