Combination question when there are 2 requirements

User Generated

Zbhfre4

Mathematics

Description

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?  

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Explanation & Answer

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


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