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Bài 4. Tìm số tự nhiên n nhỏ nhất sao cho: a) n chia cho 3, 5, 6 có số dư theo thứ tự là 1; 3; 4 b) n chia cho 3, 5, 7 có số dư theo thứ tự là 2; 3; 4 c) n chia cho 8 dư 6, chia cho 12 dư 10, chia cho 15 dư 13 và chia hết cho 23
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