Introduction to Sets

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    def average(array):
        s=set(array) #Input is in list converting into set
        avg = sum(s)/len(s)
        return f"{avg:.3f}"
       
    
    if __name__ == '__main__':
        n = int(input())
        arr = list(map(int, input().split()))
        result = average(arr)
        print(result)