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If Susan is at the store and can buy any two fruits (the store sells apples, oranges, pears, bananas, plums and kiwis), how many combinations of fruit can she choose?

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  1. order doesn't manner ... pear and plum is the same as plum and pear

    (6 * 5) / 2 = ?

    this result does not count two of the same fruit as a combination

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