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Q.

If the locus of centre of a circle which touches two given circles x2+y2=9  and x2+y2−6x+8y−11=0 externally is a hyperbola then its length of transverse axis is

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a

15

b

16

c

3

d

9

answer is C.

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Detailed Solution

|r1−r2|=|3−6|=3=2a
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