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If the circles given by S-=x^2+y^2-14x+6...

If the circles given by `S-=x^2+y^2-14x+6y+33=0` and `S' -=x^2+y^2-a^2=0(ainN)` have 4 common tangents, then the possible number of circles `S' =0` is

A

1) 1

B

2) 2

C

3) 0

D

4) infinite

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