The bottom of each domino is red or blue in turn, and is the sum of the points of the 2 squares of the preceding domino (modulo 7). The top of each domino is blue or red in turn, and is alternatively the difference and the sum of the 2 squares of the preceding domino.
In each column formed by 2 dominos, there are 2 red squares and 2 blue squares. In the 1st column, one adds 4 points to each square; in 2nd, one removes 2 from them, just as in 3rd.
摘自http://www.mensa.fr/index.php?action=admission_test
从法国Mensa提供的解释来看,第二题出错了