[問題] OG-11th橘本-Diagnostic Test-DS #25
If the units digit of integer n is greater than 2, what is the units digit
of n?
(1) The units digit of n is the same as the units digit of n^2.
(2) The units digit of n is the same as the units digit of n^3.
答案是 (E) both statements together are still not sufficient.
想問的是：
OG解釋中的(2)：
Once again, 5 and 6 are the only numbers which, when cubed, will both have
a 5 or 6 respectively in their units digit.
個人認為，應該還有 4 及 9，也符合三次方之後，個位數仍相同的條件
是否有人有相同看法？
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◆ From: 140.116.138.235
※ 編輯: currycurry 來自: 140.116.138.235 (05/05 00:06)
推
05/05 00:11, , 1F
05/05 00:11, 1F
→
05/05 00:12, , 2F
05/05 00:12, 2F
→
05/05 12:43, , 3F
05/05 12:43, 3F
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