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If a test consists of 12 true-false questions, in how many different ways can a student mark the test paper with one answer to each question?
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Since each question can be answered in two ways, there are all together
$2 \cdot 2 \cdot 2 \cdot 2 \cdot 2 \cdot 2 \cdot 2 \cdot 2 \cdot 2 \cdot 2 \cdot 2 \cdot 2=2^{12}=4,096 \text { possibilities }$
by Diamond (55,883 points)

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