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The ordered pairs, (1, 3), (2, 6), (3, 12) show the cost of theater tickets. For 1
person, the cost of a ticket is $3, the cost for 2 people is $6 and the cost for
3 people is $12. Which formula, explicit or recuſsive, would be best to use if
you wanted to know the ticket price for 9 people?