
"""simple docstring"""





def       __a	(						__lowerCamelCase    ):
   if not isinstance(__lowerCamelCase,						__lowerCamelCase    ):
      raise ValueError("Input series is not valid, valid series - [1, 2/3, 2]"    )
   if len(__lowerCamelCase    ) == 0:
      raise ValueError("Input list must be a non empty list"    )
   if len(__lowerCamelCase    ) == 1 and series[0] != 0:
      return True
   UpperCAmelCase_   :   Any     	=       []
   UpperCAmelCase_   :   Optional[Any]     	=       len(__lowerCamelCase    )
   for i in range(0,						__lowerCamelCase    ):
      if series[i] == 0:
         raise ValueError("Input series cannot have 0 as an element"    )
      rec_series.append(1 / series[i]    )
   UpperCAmelCase_   :   str     	=       rec_series[1] - rec_series[0]
   for index in range(2,						__lowerCamelCase    ):
      if rec_series[index] - rec_series[index - 1] != common_diff:
         return False
   return True







def       __a	(						__lowerCamelCase    ):
   if not isinstance(__lowerCamelCase,						__lowerCamelCase    ):
      raise ValueError("Input series is not valid, valid series - [2, 4, 6]"    )
   if len(__lowerCamelCase    ) == 0:
      raise ValueError("Input list must be a non empty list"    )
   UpperCAmelCase_   :   Dict     	=       0
   for val in series:
      answer += 1 / val
   return len(__lowerCamelCase    ) / answer


if __name__ == "__main__":
    import doctest

    doctest.testmod()










def 						A_					(						lowercase_	,  lowercase_			)				->List[Any]:







 """simple docstring"""

 SCREAMING_SNAKE_CASE				    =		1
 while b > 0:
  if b & 1:
   res *= a

  a *= a
  b >>= 1

 return res





def 						A_					(						lowercase_	,  lowercase_	,  lowercase_			)				->Any:







 """simple docstring"""

 SCREAMING_SNAKE_CASE				    =		1
 while b > 0:
  if b & 1:
   SCREAMING_SNAKE_CASE				    =		((res % c) * (a % c)) % c

  a *= a
  b >>= 1

 return res




