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Consider a chessboard with the two opposing corners removed, so that there are only 62 squares remaining. Now we take 31 dominoes, which are shaped such that each domino covers exactly two squares. Is it possible to arrange that 31 dominoes so that they cover all the 62 squares on the...

怎么证明 n(n2+5) 永远能被6整除？ n2 is square of n

刚刚听完一个发生在OTTAWA的故事，有的人为了钱，丧心病狂地否认自己以前所有的契约协议；有的人明知道是谎话，也违心地出来发誓做证，而且都是对自己恩重如山的人。 拭目以待加拿大司法的公正性。人在做，天在看！

1995 Dodge Neon for sale, automatic, good condition, green color, 149,000 kilometers, $2600 only. Quebec plate, you will get very cheaper insurance. contact: jwangzheng@hotmail.com

1995 Dodge Neon for sale, automatic, good condition, green color, 149,000 kilometers, $2600 only. Quebec plate, you will get very cheaper insurance. contact: jwangzheng@hotmail.com

1995 Dodge Neon for sale, automatic, good condition, green color, 149,000 kilometers, $2600 only. Quebec plate, you will get very cheaper insurance. contact: jwangzheng@hotmail.com