Question: Given an integer n, write a function to return all possible combinations of k numbers out of the range [1, n]. You may return the

Given an integer n, write a function to return all possible combinations of k numbers out of the range [1, n]. You may return the combinations in any order.

For example, if n = 4 and k = 2, the function should return [[1,2],[1,3],[1,4],[2,3],[2,4],[3,4]].

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