[計量] MANHATTAN PREP一數學問題

作者: ilovealv ( )   2014-05-13 23:06:06
If the units digit of an integer is 7,
then which one-digit integers is it definitely NOT divisible by?
Ans: 2,4,5,6 and 8.
但我認為是1,3,7 and 9
請問板友可以幫我解惑嗎?? 謝謝!

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