If in the expansion of (1+x)^(n),a,,b,c ...

If in the expansion of `(1+x)^(n),a,,b,c` are three consecutive coefficients, then n =

`(ac+ab+bc)/(b^(2)+ac)`

`(2ac+ab+bc)/(b^(2)-ac)`

`(ab+ac)/(b^(2)-ac)`

None of these

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