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The highest common factor is found by taking, for each common prime, the:

AAverage power
BMiddle power
CSmallest power
DLargest power
Answer & Solution
Correct answer: C. Smallest power
1. Only primes common to both count. 2. The lower exponent is used. 3. You take the smallest power. _Source: syllabus Mathematics, Chapter 1, Real Numbers._
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