Mathematics
NULL
Medium
Question
A paper has 10 true/false questions; every candidate answers all, and no two have the same sequence. How many different answer sequences are possible?
A
20
B
40
C
512
D
1024
✓ Official correct answer
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A
20
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B
40
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C
512
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D
1024
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Explanation
Each question has 2 answers ⇒ 2¹⁰ = 1024 sequences.