+51 +51 +51 +51 +51 +51 +51 +51 +51 +51 In Ms. Q's deck of cards, every card is one of four colors (red, green, blue, and yellow), and is labeled with one of seven numbers (1, 2, 3, 4, 5, 6, and 7). Among all the cards of each color, there is exactly one card labeled with each number.
और पढ़ें .. +51
