An array contains 4 letters, {\( A, B, C, D\)}. A computer randomly picks 50 letters from the array, where the probability of selecting each letter is equal. 17 of these letters are an \(A\), 9 are \( B\), 10 are \( C\) and 13 are \(D\).

Find the probability that the unknown letter is an \(A\). Write your answer correct to 2 decimal places.

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