√13
3√13
6√13
9√13
Correct answer is B
Given a=i−3j;b=−2i+5j;c=3i−j
a−b+c=(1−(−2)+3)i+(−3−5+(−1))j=6i−9j
|a−b+c|=√62+(−9)2=√36+81=√117
=√9×13=3√13
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