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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=` `(a c+a b+b c)/(b^2+a c)` b. `(2a c+a b+b c)/(b^2-a c)` c. `(a b+a c)/(b^2-a c)` d. none of these

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