Two students started a phone club. It was decided that once a month each member would call every member of the club. They also decided to expand the club by adding one new member each month. Home many phone calls would be made during the month in which the fifth member was added?

Two students started a phone club. It was decided that once a month each member would call every member of the club. They also decided to expand the club by adding one new member each month. Home many phone calls would be made during the month in which the fifth member was added?


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