



'''simple docstring'''

import math

__lowerCAmelCase		     =  10
__lowerCAmelCase		     =  7
__lowerCAmelCase		     =  BALLS_PER_COLOUR * NUM_COLOURS



def 	__lowerCamelCase	( lowerCAmelCase_ = 20    )     -> str:
		_a	: str								=				math.comb(lowerCAmelCase_		,     lowerCAmelCase_    )
		_a	: int								=				math.comb(NUM_BALLS - BALLS_PER_COLOUR		,     lowerCAmelCase_    )

		_a	: Union[str, Any]								=				NUM_COLOURS * (1 - missing_colour / total)

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


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









'''simple docstring'''

from abc import ABC, abstractmethod
from argparse import ArgumentParser

class       __magic_name__		(       _UpperCamelCase  ):







							@staticmethod
							@abstractmethod
							def 				__lowercase     (				_UpperCAmelCase   :			ArgumentParser						):
									raise NotImplementedError()







							@abstractmethod
							def 				__lowercase     (				self   :			str						):
									raise NotImplementedError()




