If a = (2, 3, -1), b = (x, 1, y) and a + b = (5, 4, 2), what is x + y?
A3
B9
C5
D6
Answer & Solution
Correct answer: D. 6
Matching components gives x = 3 and y = 3 (since -1 + y = 2), so the total is 6.
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