Q 2379023816.     What should be the value of `k` for which the
equation `3x^2 + 3y^2 + (k + 1) z^2 + x-y +z =0`
represents the sphere?

NDA 2013 Paper 1 April
A

`3`

B

`2`

C

`1`

D

`-1`

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