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For vectors ā = î + ĵ and b̄ = î - ĵ, find |ā + b̄|:
A0
B√2
C1
D2
Answer & Solution
Correct answer: D. 2
ā + b̄ = (1+1)î + (1-1)ĵ = 2î. So |ā + b̄| = 2.
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