<ul><li>One of the methods to find a duplicate number in an array of integers is by using binary search.</li><li>This method involves performing a binary search on the range of possible numbers in the array.</li><li>By comparing the count of elements greater than the midpoint of the range, the search space is narrowed down to find the duplicate number.</li><li>Another method is by using the fast and slow pointer approach, which is similar to finding a cycle in a linked list.</li></ul>

Arrays: Given an array find the duplicate number

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