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                   Thetangents drawn from the origin to the circle x2+y2-2kx-2ry+r2=0 are perpendicular if:
a.k=r
b.k=-r
c.k2=r2
d.k2+r2=1


3 years ago

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3 years ago

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 vamsi krishna 2 months ago

S 1 = 1/(1-1/2)=2 S 2 = 2/(1-1/3)=3 similarly S 10 =11 S 1 2 +S 2 2 +...................S 10 2 =2 2 +3 2 +..............11 2 =505

 manasa gorthy 2 months ago

sorry it is 506-1=505

 vamsi krishna 2 months ago
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