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It depends on what level of people are competing. If it's anything from middle school to high school, you might see something like:

What is the largest 2-digit integer that is 7 times the sum of its digits? For example, 21 = 7 x (2 + 1)

For college-level competitions you'd see harder: trig, calculus, number theory, etc.

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13y ago

What else can I help you with?