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by cmal » Tue Sep 28, 2010 1:25 am
q1) there are 2 sections in a question paper. in the first section 3 questions have to be attempted out of 4 AND IN the second one 4 out of 5. In the 2nd section the first two questions are complusory. how many choices can a student make.


q2) there are 2 sections in a question paper. in the first section 3 question s have to be attempted out of 4 and in the second one 4 out of 5 ? how many choices can student make?

Answere hass to be same for both HOW??
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by Rahul@gurome » Tue Sep 28, 2010 2:56 am
Q1)Number of ways in which 3 questions can be selected out of 4 in the first section is 4C3 = 4 ways.
Number of ways in which 4 questions can be selected from 5 when 2 questions are compulsory is 3C2 = 3.

Or required number of ways is 3*4 = 12.

For Q2), number of ways of selecting 4 out of five is 5C4 = 5.
Or required number of ways 4*5 = 20.

I do not think the answer can be same.
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by sanju09 » Tue Sep 28, 2010 3:59 am
I think there are few questions compulsory in one section of question 2 too. Why is it compulsory that the two answers should be same, by the way?
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by diebeatsthegmat » Tue Sep 28, 2010 9:47 am
cmal wrote:q1) there are 2 sections in a question paper. in the first section 3 questions have to be attempted out of 4 AND IN the second one 4 out of 5. In the 2nd section the first two questions are complusory. how many choices can a student make.


q2) there are 2 sections in a question paper. in the first section 3 question s have to be attempted out of 4 and in the second one 4 out of 5 ? how many choices can student make?

Answere hass to be same for both HOW??
i dont undertsand this question
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by cmal » Wed Sep 29, 2010 12:35 am
Because this is a GRE question
and the answer in comparison is that they are both same
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by Ian Stewart » Wed Sep 29, 2010 8:00 am
cmal wrote:q1) there are 2 sections in a question paper. in the first section 3 questions have to be attempted out of 4 AND IN the second one 4 out of 5. In the 2nd section the first two questions are complusory. how many choices can a student make.


q2) there are 2 sections in a question paper. in the first section 3 question s have to be attempted out of 4 and in the second one 4 out of 5 ? how many choices can student make?

Answere hass to be same for both HOW??
As you've written the questions, there is no way the answers could be the same; there are more restrictions in the first question, so there are fewer possibilities. If instead, in Q2, we were told that the first question was compulsory on each section of the test, then the answers would be equal.
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