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Grade: 12th pass
There are 5 subjects in an examination. In how many ways may a student fail? 
A. 16
B. 15
C. 32
D. 31
11 months ago

Answers : (2)

Vikas TU
11761 Points
Dear student 
possibility of being fail is given by the following result
Hope this helps 
Good luck 
11 months ago
Aditya Gupta
2043 Points
this can also be solved as follows:
consider the 5 spaces: __, __, __, __, __.
now, each space can be filled by P(pass) or F(fail).
so there are 2 ways to fill each space. so total number of ways to fill these 5 spaces= 2*2*2*2*2= 32. however, one of these ways would be – P, P, P, P, P, which is undesirable since this would mean that the student has passed. hence we need to subtract this case.
thus, total number of ways in which a student may fail= 32 – 1
= 31
kindly approve :)
11 months ago
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