little Johnny Bubbles enjoy spending hour computer play video game his favorite game bubble Strike fastpace bubble shoot online game playerseach game set n map have different terrain configuration first phase game decide map game play the game system randomly select map show player each player pick map discard the game system randomly select map pick player start gameJohnny deeply enthusiastic game wants spend time study map increase chance win game play map however need homework time study map that ask follow question what minimum number map I study probability play map PCan help Johnny find answer question you assume Johnnys opponent know randomly pick map