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A student is to answer 10 out of 13 questions in an examination such that he must choose atleast 4 from the first five questions .The number of choices available to him is
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a
140
b
196
c
280
d
346
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Correct option is B
The number of choices available to him isSimilar Questions
Let be a set containing elements. The number of reflexive relations that can be defined on is
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