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You are going to purchase two types of computers for your business. If computer A costs $700 and computer B costs $500, then how many of each should you buy if you need 16 computers and you have $10,000 to spend?

Four married couples have reserved 8 seats in a row at the theatre, starting at an aisle seat. How many ways can they arrange themselves if all the women sit together and all the men sit together?

Use a tree diagram showing all possible results when 4 fair coins are tossed. List the ways of getting more than 2 tails.