Suppose that there are four rows of paper clips. The first row has one paper clip, the second row has 3, the third has 5, and the fourth has 7. Two players take alternating turns in which they take away some paper clips. During a turn, a player may take any number of paper clips from a row, but may only take paper clips from that row. For example, if the first player on the first turn decides to take from the third row, he can take 1, 2, 3, 4, or 5 paper clips from that row, but he cannot also take a paper clip from the second row. The player who takes the last paper clip loses.
Which player, the one who goes first or the one who goes second, wins? How can he guarantee a win?
