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a student has to answer 7 out of 10 questions on an exam.

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a student has to answer 7 out of 10 questions on an exam.  [#permalink]

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New post 22 Dec 2017, 11:03
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a student has to answer 7 out of 10 questions on an exam. how many ways can he make his selection if:
a- there are no restrictions?
b-he must answer the first two question or the last three questions?

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Re: a student has to answer 7 out of 10 questions on an exam.  [#permalink]

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New post 22 Dec 2017, 11:10
A) 10c7 = 120

B) is it 10! - 10c8 + 10! - 10c7 ?


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Re: a student has to answer 7 out of 10 questions on an exam. &nbs [#permalink] 22 Dec 2017, 11:10
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a student has to answer 7 out of 10 questions on an exam.

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