Mathematical Puzzles: What is () + () + () = 30 using 1,3,5,7,9,11,13,15?
If a set such that S= {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20} then how many subset can be made where the product of elements will be even?