This topic is locked. If you want to discuss this question please re-post it in the respective forum.
Jerome wrote each of the integers 1 through 20 inclusive, on separate index cards. He placed the cards in a box, then drew cards one at a time randomly from the box without returning the cards he had already drawn to the box. In order to ensure that the sum of all the cards he drew was even, how many cards did Jerome have to draw?