A test consists of 12 questions out of which candidates a...
A test consists of 12 questions out of which candidates are to answer 10. If the first 6 are compulsory, in how many ways can each candidate select her questions?
40
25
15
10
Correct answer is C
The first 6 questions can only be selected in 1 way.
The remaining 4 questions can be selected in 6C4 ways.
= 6!(6−4)!4!=15
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