Q 2319580419.     If the radius of the sphere

`x^2 + y^2 +z^2 - -6x - 8y + 10z + llambda = 0`
is unity, what is the value of `lambda` ?

NDA 2008 Paper 1 September
A

`49`

B

`7`

C

`-49`

D

`-7`

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