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Language/Type: C# recursion

Write a recursive method named HashString that accepts an integer parameter k and returns a string of # (hash symbols) that is 2k characters long (i.e., 2 to the kth power). For example, the call of HashString(3) returns "########". Throw an ArgumentException if k is less than 0. Do not use loops; you must use recursion.

Method: Write a C# method as described, not a complete program or class.

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