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Q3) When (n-1)(n+1) is divided by 24, what is the remainder?
(1) n is not the multiple of 2
(2) n is the multiple of 3
- 24 = 23¡¤31
- (1)¿¡ ÀÇÇØ ¿¬¼ÓµÈ µÎ °³ÀÇ Â¦¼öÀÇ °öÀÌ´Ï 8ÀÇ ¹è¼öÀÓÀ» È®ÀÎ. 24ÀÇ prime factorÀÎ 3¹è¼ö(¶Ç´Â ³ª¸ÓÁö)¿¡ ´ëÇÑ Á¤º¸°¡ ÇÊ¿ä.
- (2)¿¡ ÀÇÇϸé (n-1)ÀÇ ³ª¸ÓÁö´Â 2, (n+1)ÀÇ ³ª¸ÓÁö´Â 1, µÎ ¼ýÀÚÀÇ unit digitÀ» °öÇϸé 2À̹ǷÎ, ³ª¸ÓÁö´Â Ç×»ó 2
- ´ä ¡®C¡¯
¶ó°í Ç®¸é µÇ³ª¿ä?
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