In a survey of 300 members of a local sports club, 180 members indicated that they plan to attend the next Summer or Winter Olympic Games, 150 members indicated that they plan to attend the next Summer Olympic Games, and 90 indicated that they plan to attend the next Winter Olympic Games. How many members of the club plan to attend.
a) both of the games? _____ members
b) exactly one of the games? _____ members
c) The summer Olympic games only? _____ members
d) none of the games? _____ members