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In an examination a candidate has to pass in each of the four subjects.In how many ways can he fail?

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In an examination a candidate has to pass in each of the four subjects.In how many ways can he fail?

(a) 15 

(b) 20 

(c) 25 

(d)10

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1 Answer

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Best answer

Correct option: (a) 15

Explanation:

There are two possibilities for each subject.

∴ Total possibilities 2 x 2 x 2 x 2 = 16

∴ Number of ways to be fail = 16 - 1 = 15

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