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Point underline(Q) is symmetric to P(4,-...

Point `underline(Q)` is symmetric to `P(4,-1)` with respect to the bisector of the first quadrant. Then, length of `P Q` is

A

`3 sqrt(2)`

B

`5 sqrt(2)`

C

`7 sqrt(2)`

D

`9 sqrt(2)`

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The correct Answer is:
B
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