1) Number of ways of selecting three squares on a chessboard so that all the three be on a diagonal line of the board or parallel to it is A) 196 B) 126 C) 252 D) 392 Answer: Option DExplanation:Number of ways $=[(^{3}C_{3}+^{4}C_{3}+^{5}C_{3}+^{6}C_{3}+^{7}C_{3})\times2+^{8}C_{3}]\times2$ =392
