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At least two people have the same birthday in a school of 150 students

Mrs. morton has a special reward system for her class. when all her students behave well, she rewards them by putting 3 marbles into a marble jar. when the jar has 100 or more marbles, the students have a party. right now, the the jar has 24 marbles. how could mrs. morton reward the class in order for the students to have a party?

Which spreadsheet would be used to compute the first nine terms of the geometric sequence a^n=32•(1/2)n-1