T\u00ecm hi\u1ec3u v\u1ec1 k\u00e8o ch\u1eb5n l\u1ebb<\/figcaption><\/figure>\nTr\u01b0\u1edbc khi \u0111i v\u00e0o chi ti\u1ebft c\u00e1c lo\u1ea1i k\u00e8o ch\u1eb5n l\u1ebb v\u00e0 c\u00e1ch b\u1eaft k\u00e8o ch\u1eb5n l\u1ebb hi\u1ec7u qu\u1ea3, ch\u00fang ta c\u1ea7n hi\u1ec3u r\u00f5 c\u00e1ch k\u00e8o ch\u1eb5n l\u1ebb l\u00e0 g\u00ec. \u0110\u00e2y l\u00e0 m\u1ed9t h\u00ecnh th\u1ee9c c\u00e1 c\u01b0\u1ee3c m\u00e0 ng\u01b0\u1eddi ch\u01a1i ph\u1ea3i d\u1ef1 \u0111o\u00e1n xem t\u1ed5ng s\u1ed1 b\u00e0n th\u1eafng \u0111\u01b0\u1ee3c ghi trong m\u1ed9t tr\u1eadn \u0111\u1ea5u s\u1ebd l\u00e0 s\u1ed1 ch\u1eb5n hay s\u1ed1 l\u1ebb.<\/span><\/p>\nK\u00e8o ch\u1eb5n l\u1ebb th\u01b0\u1eddng xu\u1ea5t hi\u1ec7n v\u1edbi t\u1ec9 l\u1ec7 \u0103n c\u01b0\u1ee3c kh\u00e1 h\u1ea5p d\u1eabn, l\u00e0m cho nhi\u1ec1u ng\u01b0\u1eddi l\u1ef1a ch\u1ecdn tham gia. Tuy nhi\u00ean, kh\u00f4ng ph\u1ea3i ai c\u0169ng n\u1eafm r\u00f5 c\u00e1ch \u0111\u1eb7t c\u01b0\u1ee3c sao cho th\u00f4ng minh v\u00e0 ch\u00ednh x\u00e1c. V\u1eady \u0111i\u1ec1u g\u00ec t\u1ea1o n\u00ean s\u1ef1 h\u1ea5p d\u1eabn c\u1ee7a k\u00e8o ch\u1eb5n l\u1ebb?<\/span><\/p>\nKh\u00e1i ni\u1ec7m k\u00e8o ch\u1eb5n l\u1ebb<\/b><\/h3>\n
K\u00e8o ch\u1eb5n l\u1ebb (Odd\/Even) l\u00e0 m\u1ed9t lo\u1ea1i k\u00e8o c\u00e1 c\u01b0\u1ee3c b\u00f3ng \u0111\u00e1, trong \u0111\u00f3 ng\u01b0\u1eddi ch\u01a1i \u0111\u1eb7t c\u01b0\u1ee3c v\u00e0o t\u1ed5ng s\u1ed1 b\u00e0n th\u1eafng c\u1ee7a m\u1ed9t tr\u1eadn \u0111\u1ea5u ho\u1eb7c m\u1ed9t hi\u1ec7p \u0111\u1ea5u (ho\u1eb7c c\u00e1c y\u1ebfu t\u1ed1 kh\u00e1c) s\u1ebd l\u00e0 s\u1ed1 ch\u1eb5n hay l\u1ebb. \u0110\u00e2y l\u00e0 m\u1ed9t d\u1ea1ng c\u00e1 c\u01b0\u1ee3c \u0111\u01a1n gi\u1ea3n, d\u1ec5 hi\u1ec3u, \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng r\u1ed9ng r\u00e3i trong c\u00e1c tr\u1eadn \u0111\u1ea5u b\u00f3ng \u0111\u00e1.<\/span><\/p>\nT\u1ea1i sao k\u00e8o ch\u1eb5n l\u1ebb l\u1ea1i ph\u1ed5 bi\u1ebfn?<\/b><\/h3>\n
K\u00e8o ch\u1eb5n l\u1ebb tr\u1edf n\u00ean ph\u1ed5 bi\u1ebfn nh\u1edd v\u00e0o nhi\u1ec1u l\u00fd do. \u0110\u1ea7u ti\u00ean, n\u00f3 d\u1ec5 hi\u1ec3u v\u00e0 kh\u00f4ng y\u00eau c\u1ea7u ki\u1ebfn th\u1ee9c qu\u00e1 s\u00e2u v\u1ec1 b\u00f3ng \u0111\u00e1. H\u1ea7u h\u1ebft m\u1ecdi ng\u01b0\u1eddi \u0111\u1ec1u c\u00f3 th\u1ec3 tham gia m\u00e0 kh\u00f4ng c\u1ea7n ph\u1ea3i t\u00ecm hi\u1ec3u qu\u00e1 nhi\u1ec1u v\u1ec1 quy lu\u1eadt ph\u1ee9c t\u1ea1p c\u1ee7a tr\u1eadn \u0111\u1ea5u.<\/span><\/p>\nNgo\u00e0i ra, k\u00e8o ch\u1eb5n l\u1ebb th\u01b0\u1eddng c\u00f3 t\u1ef7 l\u1ec7 tr\u1ea3 th\u01b0\u1edfng cao n\u1ebfu ng\u01b0\u1eddi ch\u01a1i bi\u1ebft c\u00e1ch ph\u00e2n t\u00edch v\u00e0 \u0111\u1eb7t c\u01b0\u1ee3c \u0111\u00fang h\u01b0\u1edbng. Ch\u00ednh v\u00ec v\u1eady, n\u00f3 thu h\u00fat kh\u00f4ng ch\u1ec9 nh\u1eefng ng\u01b0\u1eddi m\u1edbi m\u00e0 c\u00f2n c\u1ea3 nh\u1eefng cao th\u1ee7 l\u00e2u n\u0103m trong gi\u1edbi c\u00e1 c\u01b0\u1ee3c.<\/span><\/p>\nPh\u00e2n t\u00edch c\u00e1c lo\u1ea1i k\u00e8o ch\u1eb5n l\u1ebb ph\u1ed5 bi\u1ebfn<\/b><\/h2>\n