Q. 253.7( 3 Votes )

If the distance b A. 5

B. ± 5

C. – 5

D. none of these

Answer :

Let P be the point whose coordinate is (a, 0, 1) and Q represents the point (0, 1, 2).


Given, PQ = √27


From distance formula-


PQ =



Squaring both sides-


a2 + 2 = 27


a2 = 25


a = ±√25 = ±5


a = 5 or a = -5


Option (A) and (B) both have one correct answer but only option (C) contains both the answers


Hence, option(C) is the most suitable choice.

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