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A line passes through A(4,-6,-2) and B(1...

A line passes through `A(4,-6,-2)` and `B(16,-2,4`" .The point `P(a,b,c)` ,where `a,,b,c` are non-negative integers,on the line `AB` lies at a distance of `21` units,from the point `A` .The distance between the points `P(a,b,c)` and `Q(4,-12,3)` is equal to:

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