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If f:NtoR is defined by f(1) = - 1 and f...

If `f:NtoR` is defined by f(1) = - 1 and f(n+1) = 3f(n) + 2 for `nge1`, then f is

A

one - one

B

onto

C

a constant function

D

`f(n)gt 0 for n gt1`

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