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Let S = {1, 2, 3, … , 100}. The number of non-empty subsets A of S such that the product of elements in A is even is :

1. 2 50 – 1
2. 2 50 (2 50 – 1)
3. 2 100 – 1
4. 2 50 + 1

Correct answer: 2 50 (2 50 – 1)

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