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Byju's Answer
Standard XII
Mathematics
Combination
A question pa...
Question
A question paper has 5 questions. Each question has an alternative. The number of ways in which a student can attempt at least one question is?
A
2
5
−
1
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B
3
5
−
1
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C
3
4
−
1
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D
None of these
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Solution
The correct option is
A
2
5
−
1
Each question have
2
choices (answer the question or answer its alternative or leave the question).
∴
, total number of ways
=
2
×
2
×
2
×
2
×
2
=
2
5
ways
But in these
2
5
ways, there is one way in which no question is attended.
∴
Required number of ways
=
2
5
−
1
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