Q 2328412301.     If `alpha` and `beta` are the roots of the equation
`x^2 + bx + c = 0`, then what is the value of
`alpha^(-1) + beta^(-1)`?

NDA 2013 Paper 1 April
A

` - b/a`

B

`b/c`

C

`c/b`

D

` - c/b`

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