A bag contains \(6\) \(\color{Red} {\text{red}}\) and \(3\) \({\text{white}}\) balls.Four balls are drawn out randomly one by one and are not replaced.What is the probability that they are alternatively of different colours?

\(\textbf{Details and Assumptions}\)

One such sequence may be: \(\color{Red} {\textbf{red}}\),\({\textbf{white}}\),\(\color{Red} {\textbf{red}}\),\({\textbf{white}}\)

If the probability can be expressed in the form \(\dfrac{a}{b}\)where \(a\) and \(b\) are co prime integers then find \(a+b\)

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