单选题X= {1, 2, 4} Y= {1, 3, 4}12 If, in the sets above, x is any number in set X and y is any number in set Y, how many different values of x+y are possible?AFiveBSixCSevenDEightENine
单选题
X= {1, 2, 4} Y= {1, 3, 4}12 If, in the sets above, x is any number in set X and y is any number in set Y, how many different values of x+y are possible?
A
Five
B
Six
C
Seven
D
Eight
E
Nine
参考解析
解析：
Given X = {1, 2, 4} and Y= {1, 3, 4}, make a list of all the possible sums x+y: 1+1=2; 2+1=3; 4+1=5; 1+3=4; 2+3=5; 4+3=7; 1+4=5; 2+4=6; 4+4=8 Hence, seven different values of x+y are possible: 2,3,4,5,6,7, and 8.
Given X = {1, 2, 4} and Y= {1, 3, 4}, make a list of all the possible sums x+y: 1+1=2; 2+1=3; 4+1=5; 1+3=4; 2+3=5; 4+3=7; 1+4=5; 2+4=6; 4+4=8 Hence, seven different values of x+y are possible: 2,3,4,5,6,7, and 8.
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