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Q.

The set of all real values of λ for which exactly two common tangents can be drawn to the circle x2+y24x4y+6=0 and x2+y210x10y+λ=0  is the interval

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a

(18,42)

b

(12,24)

c

(18,48)

d

(12,32)

answer is B.

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Detailed Solution

|r1r2|<c1c2<r1+r2

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