C\u00e1c c\u1ea7u l\u00f4 k\u00e9p<\/strong><\/h2>\nL\u00f4 k\u00e9p l\u00e0 m\u1ed9t lo\u1ea1i l\u00f4 \u0111\u01b0\u1ee3c r\u1ea5t nhi\u1ec1u ng\u01b0\u1eddi ch\u01a1i t\u00ecm \u0111\u1ebfn, \u00e1p d\u1ee5ng ch\u1ee7 y\u1ebfu d\u1ef1a v\u00e0o k\u1ebft qu\u1ea3 x\u1ed5 s\u1ed1 mi\u1ec1n B\u1eafc. Kh\u00f4ng ch\u1ec9 n\u00f3 d\u1ec5 d\u00e0ng c\u00f3 th\u1ec3 t\u00ednh ra \u0111\u01b0\u1ee3c c\u00e1c con s\u1ed1 \u0111\u1eb9p nh\u1ea5t trong ng\u00e0y. M\u00e0 n\u00f3 c\u0169ng l\u00e0 m\u1ed9t l\u1ed1i ch\u01a1i kh\u00e1 \u0111\u01a1n gi\u1ea3n v\u00e0 d\u1ec5 hi\u1ec3u.<\/p>\n
K\u00e9p b\u1eb1ng<\/strong><\/h3>\nK\u00e9p b\u1eb1ng l\u00e0 lo\u1ea1i l\u00f4 k\u00e9p \u0111\u01b0\u1ee3c ch\u01a1i ph\u1ed5 bi\u1ebfn nh\u1ea5t c\u1ee7a x\u1ed5 s\u1ed1 mi\u1ec1n B\u1eafc. M\u1ed9t ph\u1ea7n l\u00e0 b\u1edfi kh\u00e1i ni\u1ec7m \u0111\u01a1n gi\u1ea3n d\u1ec5 nh\u1edb c\u1ee7a n\u00f3. Ch\u00fang ta hi\u1ec3u k\u00e9p b\u1eb1ng l\u00e0 s\u1ed1 c\u00f3 hai ch\u1eef s\u1ed1 gi\u1ed1ng nhau bao g\u1ed3m 10 s\u1ed1 l\u00e0: 00, 11, 22, 33, 44, 55, 66, 77, 88, 99. Lo\u1ea1i l\u00f4 k\u00e9p n\u00e0y h\u1ea7u nh\u01b0 ng\u00e0y n\u00e0o c\u0169ng xu\u1ea5t hi\u1ec7n trong b\u1ea3ng k\u1ebft qu\u1ea3 x\u1ed5 s\u1ed1. V\u00ec th\u1ebf, nu\u00f4i l\u00f4 k\u00e9p b\u1eb1ng s\u1ebd c\u00f3 x\u00e1c xu\u1ea5t th\u1eafng cao h\u01a1n n\u00ean lu\u00f4n \u0111\u01b0\u1ee3c ng\u01b0\u1eddi ch\u01a1i \u01b0u ti\u00ean h\u00e0ng \u0111\u1ea7u.<\/p>\n
K\u00e9p l\u1ec7ch<\/strong><\/h3>\nK\u00e9p l\u1ec7ch kh\u00e1c v\u1edbi k\u00e9p b\u1eb1ng n\u00f3 kh\u00f4ng ph\u1ea3i l\u00e0 s\u1ed1 c\u00f3 hai ch\u1eef s\u1ed1 h\u00e0ng ch\u1ee5c v\u00e0 h\u00e0ng \u0111\u01a1n v\u1ecb gi\u1ed1ng nhau. M\u00e0 hai s\u1ed1 n\u00e0y l\u00e0 b\u00f3ng c\u1ee7a nhau, k\u00e9p l\u1ec7ch c\u0169ng bao g\u1ed3m 10 b\u1ed9 s\u1ed1: 05 50, 16 61, 27 72, 38 83, 49 94.<\/p>\n
K\u00e9p b\u1eb1ng l\u00e0 lo\u1ea1i l\u00f4 k\u00e9p \u0111\u01b0\u1ee3c ch\u01a1i ph\u1ed5 bi\u1ebfn nh\u1ea5t c\u1ee7a x\u1ed5 s\u1ed1 mi\u1ec1n B\u1eafc. M\u1ed9t ph\u1ea7n l\u00e0 b\u1edfi kh\u00e1i ni\u1ec7m \u0111\u01a1n gi\u1ea3n d\u1ec5 nh\u1edb c\u1ee7a n\u00f3. Ch\u00fang ta hi\u1ec3u k\u00e9p b\u1eb1ng l\u00e0 s\u1ed1 c\u00f3 hai ch\u1eef s\u1ed1 gi\u1ed1ng nhau bao g\u1ed3m 10 s\u1ed1 l\u00e0: 00, 11, 22, 33, 44, 55, 66, 77, 88, 99. Lo\u1ea1i l\u00f4 k\u00e9p n\u00e0y h\u1ea7u nh\u01b0 ng\u00e0y n\u00e0o c\u0169ng xu\u1ea5t hi\u1ec7n trong b\u1ea3ng k\u1ebft qu\u1ea3 x\u1ed5 s\u1ed1. V\u00ec th\u1ebf, nu\u00f4i l\u00f4 k\u00e9p b\u1eb1ng s\u1ebd c\u00f3 x\u00e1c xu\u1ea5t th\u1eafng cao h\u01a1n n\u00ean lu\u00f4n \u0111\u01b0\u1ee3c ng\u01b0\u1eddi ch\u01a1i \u01b0u ti\u00ean h\u00e0ng \u0111\u1ea7u.<\/p>\n