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In an examination, a minimum of marks is to be scored in

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Manager
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Joined: 24 Jan 2005
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In an examination, a minimum of marks is to be scored in [#permalink]

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New post 19 Mar 2005, 09:20
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

In an examination, a minimum of marks is to be scored in each 6 subjects to pass. How many ways can a student fail.

(a) 6
(b) 21
(c) 63
(d) 84
(e) 72

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Re: PC Perm and Comb [#permalink]

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New post 19 Mar 2005, 11:26
anirban16 wrote:
In an examination, a minimum of marks is to be scored in each 6 subjects to pass. How many ways can a student fail.

(a) 6
(b) 21
(c) 63
(d) 84
(e) 72


(C) 63,

Two possible outcomes for each test => total of 2^6 outcomes.
One is a pass outcome, the remaining are the failure cases.
Thus failure ways = 64 - 1 = 63.

Hope that helps.
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New post 19 Mar 2005, 11:34
"C"

All possibilities - when he passes all.

2^6 -1 = 63

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  [#permalink] 19 Mar 2005, 11:34
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In an examination, a minimum of marks is to be scored in

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