The third is either A or B, depending on your assumptions. Most likely the "correct" answer is A, but I would argue it's B, since (-1)C(-1) <span>is not equal to 1 (it's not defined).
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First find out how many beads cover 1 inch of the string which is 4 beads then multiply that number, 4, by the length of the string, 13. You should get 52.
