input: 
  from typing import List
  
  def reverse_combine_strings(strings: List[str]) -> str:
      """ Combines a list of strings into one string and then reverses the result.
      >>> reverse_combine_strings(["Hello ", "world!"])
      '!dlrow olleH'
      >>> reverse_combine_strings(["a", "b", "c"])
      'cba'
      """
  
output:     combined_string = ''.join(strings)
      return combined_string[::-1]