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Question

The equations of two circles are
x2+y2+2λx+5=0 and x2+y2+2λy+5=0. P is any point on the line xy=0. lf PA and PB are the lengths of the tangents from P to the two circles and PA=3 then PB=______

A
1.6
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B
6
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C
4
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D
3
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