Find the distance between the points \( P \) and \( Q \) having coordinates \( (-2,3,1) \) and \...
Find the distance between the points \( P \) and \( Q \) having coordinates \( (-2,3,1) \) and \( (2,1,2) \).
(a) \( \sqrt{23} \)
(b) 4
(c) \( \sqrt{21} \)
(d) \( \sqrt{19} \)
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