if a,b,c and d are the coefficient of four consecutive terms in the expansion of `(1+x)^(n)` then `(a)/(a+b)+(C) /(c+d)=?`

if a,b,c and d are the coefficient of four consecutive terms in the expansion of `(1+x)^(n)` then `(a)/(a+b)+(C) /(c+d)=?`
A. `(b)/(b+c)`
B. `(b)/(2(b+c))`
C. `(2b)/(b+c)`
D. `(2c)/(b+c)`

if a,b,c and d are the coefficient of four consecutive terms in the expansion of `(1+x)^(n)` then `(a)/(a+b)+(C) /(c+d)=?`

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