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If a line has l = 1/2 and m = 1/2, then n equals:
A±√2
B±1/√2
C±1/4
D±1/2
Answer & Solution
Correct answer: B. ±1/√2
From n² = 1 - 1/4 - 1/4 = 1/2 we get n = ±1/√2.
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