AMC8 1993
AMC8 1993 · Q3
AMC8 1993 · Q3. It mainly tests Primes & prime factorization.
Which of the following numbers has the largest prime factor?
以下哪个数的最大质因数最大？
(A)
39
39
(B)
51
51
(C)
77
77
(D)
91
91
(E)
121
121
Answer
Correct choice: (B)
正确答案：（B）
Solution
39 = 3×13, 51 = 3×17, 77 = 7×11, 91 = 7×13, 121 = 11². Largest prime factor is 17.
39 = 3×13, 51 = 3×17, 77 = 7×11, 91 = 7×13, 121 = 11²。最大质因数是17。
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