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If the circles x^2+y^2+2lambdax+2=0 and ...

If the circles `x^2+y^2+2lambdax+2=0` and `x^2+y^2+4y+2=0` touch each other, then `lambda=`

A

1) `+-1`

B

2) `+-2`

C

3) `+-3`

D

4) `+-4`

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