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If A and B are the points (3, 4, 5) and ...

If A and B are the points (3, 4, 5) and (-1, 3,-7) respectively then theset of points Psuch that`PA ^(2) + PB ^(2) = K ^(2),` where K is a constant lie on a proper sphere if:

A

`K ^(2) lt (161)/(2)`

B

`K ^(2) gt (161)/(2)`

C

`K ^(2) = (161)/(2)`

D

`K =1`

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The correct Answer is:
B
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