Free Practice Question
PS · Problem Solving
705-805
Divisibility/Multiples/Factors
What is the largest prime factor of the expression ?
Answer Choices
Correct answer marked belowA
2
B
3
C
5
D
17
29
Correct
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Explanation
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Official Explanation
Official
Given = = = (81 + 64)(81 - 64) = = (5 × 29)(9 + 8)(9 - 8) = 5 × 29 × 17 × 1…
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What it tests
Your understanding of divisibility rules, least common multiples, and greatest common factors.
Common trap
Forgetting that 1 is not prime and that every integer divides 0.
Details
Difficulty
705-805
Type
PS
Category