Amdocs Programmer interview questions

1. 50 red balls, 50 white balls. What is the way to arrange all the balls in 2 urns and get the highest probability to take out a red ball? 2. 2. 13 cards from 1 to 13. Take a first card from the deck and place at the end of the deck, take a second card and set aside and so on until the cards run out. When the cards are turned over they are arranged in order from 1 to 13. What was the first card in the pack in the beginning?