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If the circles x^2+y^2=a\ a n d\ x^2+y^2...

If the circles `x^2+y^2=a\ a n d\ x^2+y^2-6x-8y+9=0` touch externally then `a=` a. 1 b. `-1` c. `21` d. 16

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RD SHARMA ENGLISH-THE CIRCLE-All Questions
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