


import math

UpperCamelCase					:       List[str]			    =     10
UpperCamelCase					:       List[str]			    =     7
UpperCamelCase					:       str			    =     BALLS_PER_COLOUR * NUM_COLOURS



def UpperCamelCase_				(				__a = 20      )	->   str:
      a__	:  str     =   math.comb(__a			,				__a      )
      a__	:  Optional[Any]     =   math.comb(NUM_BALLS - BALLS_PER_COLOUR			,				__a      )

      a__	:  Any     =   NUM_COLOURS * (1 - missing_colour / total)

      return f'''{result:.9f}'''


if __name__ == "__main__":
    print(solution(20))







def 				A__ (snake_case   :		int				)     ->						bool:
					if number < 0:
										raise ValueError("""number must not be negative"""				)
					return number & (number - 1) == 0


if __name__ == "__main__":
	import doctest

	doctest.testmod()






