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 (JEE Main 2014)

JEE Main Mathematics question

Let . The number of non-empty subsets of such that the product of elements in is even is (JEE Main 2014)

Answer: (B)

The product is even iff contains an even number. Required .

Question ID VK-003262