A bag contains $$\(n\)$$ beads. 6 of the beads are red and the rest are blue. Ravi is going to take at random 2 beads from the bag. The probability that the 2 beads will be of the same colour is $$\(\frac{9}{17}\)$$ Using algebra, and showing each stage of your working, calculate the value of $$\(n\)$$. $$\[ n=. \]$$

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