$$\(24 O X Y Z\)$$ is a trapezium. $$\(M\)$$ is the midpoint of $$\(O X\)$$ $$\(N\)$$ is the point such that $$\(M N Z\)$$ and $$\(O N Y\)$$ are straight lines. Given that $$\(O N: O Y=\lambda: 1\)$$ use a vector method to find the value of $$\(\lambda\)$$

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