Q: One-third of a class of 39 students took part in a math competition. How many students did not participate in the competition?
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A: Since one-third of the class participated, there are 39 * 1/3 = <<39*1/3=13>>13 students who participated in the competition.
This means that 39 – 13 = <<39-13=26>>26 students did not participate. The answer is  26.
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