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January 20th, 2016, 04:38 AM  #1 
Senior Member Joined: Oct 2013 From: Far far away Posts: 422 Thanks: 18  questions on a test
A student must answer 7 out of 10 questions on a test. A) how many ways does she have to do this? B) how many ways does she have if she must answer the first two? My attempt: A) 10C7 = 120 different ways B) 8C5 = 56 different ways Am I correct? Thanks. 
January 20th, 2016, 05:29 AM  #2 
Math Team Joined: Dec 2013 From: Colombia Posts: 7,599 Thanks: 2587 Math Focus: Mainly analysis and algebra 
Looks OK to me (subject to Country Boy's usual question).


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