Bài style="mso-bidi-font-weight: normal"> 18: style="font-size:12.0pt;mso-bidi-font-size: 11.0pt;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family: Calibri;color:black;mso-font-width:297%;mso-no-proof:yes"> a) style="font-size:12.0pt;mso-bidi-font-size:11.0pt;mso-ascii-font-family:Calibri; mso-hansi-font-family:Calibri;mso-bidi-font-family:Calibri;color:black; letter-spacing:.4pt;mso-no-proof:yes"> Có style="font-size:12.0pt; mso-bidi-font-size:11.0pt;mso-ascii-font-family:Calibri;mso-hansi-font-family: Calibri;mso-bidi-font-family:Calibri;color:black;letter-spacing:.55pt; mso-no-proof:yes"> bao nhiêu style="font-size:12.0pt;mso-bidi-font-size:11.0pt;mso-ascii-font-family:Calibri; mso-hansi-font-family:Calibri;mso-bidi-font-family:Calibri;color:black; letter-spacing:.35pt;mso-no-proof:yes"> số style="font-size:12.0pt;mso-bidi-font-size:11.0pt;mso-ascii-font-family:Calibri; mso-hansi-font-family:Calibri;mso-bidi-font-family:Calibri;color:black; letter-spacing:.55pt;mso-no-proof:yes"> tự style="font-size:12.0pt;mso-bidi-font-size:11.0pt;mso-ascii-font-family:Calibri; mso-hansi-font-family:Calibri;mso-bidi-font-family:Calibri;color:black; letter-spacing:.05pt;mso-no-proof:yes"> nhiênn style="font-size:12.0pt;mso-bidi-font-size:11.0pt;mso-ascii-font-family:Calibri; mso-hansi-font-family:Calibri;mso-bidi-font-family:Calibri;color:black; letter-spacing:.1pt;mso-no-proof:yes"> gồm style="font-size:12.0pt; mso-bidi-font-size:11.0pt;mso-ascii-font-family:Calibri;mso-hansi-font-family: Calibri;mso-bidi-font-family:Calibri;color:black;letter-spacing:-.05pt; mso-no-proof:yes"> 6 style="font-size:12.0pt;mso-bidi-font-size: 11.0pt;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family: Calibri;color:black;letter-spacing:.35pt;mso-no-proof:yes"> chữ style="font-size:12.0pt;mso-bidi-font-size:11.0pt;mso-ascii-font-family:Calibri; mso-hansi-font-family:Calibri;mso-bidi-font-family:Calibri;color:black; letter-spacing:.3pt;mso-no-proof:yes"> số style="font-size:12.0pt; mso-bidi-font-size:11.0pt;mso-ascii-font-family:Calibri;mso-hansi-font-family: Calibri;mso-bidi-font-family:Calibri;color:black;letter-spacing:.55pt; mso-no-proof:yes"> khác style="font-size:12.0pt;mso-bidi-font-size: 11.0pt;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family: Calibri;color:black;letter-spacing:.3pt;mso-no-proof:yes"> nhau mà tổng các chữ số đó style="font-size:12.0pt;mso-bidi-font-size: 11.0pt;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family: Calibri;color:black;letter-spacing:.55pt;mso-no-proof:yes"> bằng style="font-size:12.0pt;mso-bidi-font-size:11.0pt;mso-ascii-font-family:Calibri; mso-hansi-font-family:Calibri;mso-bidi-font-family:Calibri;color:black; letter-spacing:.35pt;mso-no-proof:yes"> 18? b) style="font-size:12.0pt;mso-bidi-font-size: 11.0pt;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family: Calibri;color:black;letter-spacing:.4pt;mso-no-proof:yes"> Hỏi style="font-size:12.0pt;mso-bidi-font-size:11.0pt;mso-ascii-font-family:Calibri; mso-hansi-font-family:Calibri;mso-bidi-font-family:Calibri;color:black; letter-spacing:-.05pt;mso-no-proof:yes"> có style="font-size:12.0pt;mso-bidi-font-size:11.0pt;mso-ascii-font-family:Calibri; mso-hansi-font-family:Calibri;mso-bidi-font-family:Calibri;color:black; letter-spacing:.55pt;mso-no-proof:yes"> bao nhiêu style="font-size:12.0pt;mso-bidi-font-size:11.0pt;mso-ascii-font-family:Calibri; mso-hansi-font-family:Calibri;mso-bidi-font-family:Calibri;color:black; letter-spacing:.35pt;mso-no-proof:yes"> số style="font-size:12.0pt;mso-bidi-font-size:11.0pt;mso-ascii-font-family:Calibri; mso-hansi-font-family:Calibri;mso-bidi-font-family:Calibri;color:black; letter-spacing:.55pt;mso-no-proof:yes"> lẻ style="font-size:12.0pt;mso-bidi-font-size:11.0pt;mso-ascii-font-family:Calibri; mso-hansi-font-family:Calibri;mso-bidi-font-family:Calibri;color:black; letter-spacing:.3pt;mso-no-proof:yes"> thoả style="font-size:12.0pt;mso-bidi-font-size:11.0pt;mso-ascii-font-family:Calibri; mso-hansi-font-family:Calibri;mso-bidi-font-family:Calibri;color:black; letter-spacing:.3pt;mso-no-proof:yes"> mãn điều style="font-size:12.0pt;mso-bidi-font-size: 11.0pt;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family: Calibri;color:black;letter-spacing:.35pt;mso-no-proof:yes"> kiện style="font-size:12.0pt;mso-bidi-font-size:11.0pt;mso-ascii-font-family:Calibri; mso-hansi-font-family:Calibri;mso-bidi-font-family:Calibri;color:black; letter-spacing:.1pt;mso-no-proof:yes"> đó?* chỉ giùm em cách tính tổng nhé. Tổ hợp
b) style="font-size:12.0pt;mso-bidi-font-size: 11.0pt;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family: Calibri;color:black;letter-spacing:.4pt;mso-no-proof:yes"> Hỏi style="font-size:12.0pt;mso-bidi-font-size:11.0pt;mso-ascii-font-family:Calibri; mso-hansi-font-family:Calibri;mso-bidi-font-family:Calibri;color:black; letter-spacing:-.05pt;mso-no-proof:yes"> có style="font-size:12.0pt;mso-bidi-font-size:11.0pt;mso-ascii-font-family:Calibri; mso-hansi-font-family:Calibri;mso-bidi-font-family:Calibri;color:black; letter-spacing:.55pt;mso-no-proof:yes"> bao nhiêu style="font-size:12.0pt;mso-bidi-font-size:11.0pt;mso-ascii-font-family:Calibri; mso-hansi-font-family:Calibri;mso-bidi-font-family:Calibri;color:black; letter-spacing:.35pt;mso-no-proof:yes"> số style="font-size:12.0pt;mso-bidi-font-size:11.0pt;mso-ascii-font-family:Calibri; mso-hansi-font-family:Calibri;mso-bidi-font-family:Calibri;color:black; letter-spacing:.55pt;mso-no-proof:yes"> lẻ style="font-size:12.0pt;mso-bidi-font-size:11.0pt;mso-ascii-font-family:Calibri; mso-hansi-font-family:Calibri;mso-bidi-font-family:Calibri;color:black; letter-spacing:.3pt;mso-no-proof:yes"> thoả style="font-size:12.0pt;mso-bidi-font-size:11.0pt;mso-ascii-font-family:Calibri; mso-hansi-font-family:Calibri;mso-bidi-font-family:Calibri;color:black; letter-spacing:.3pt;mso-no-proof:yes"> mãn điều style="font-size:12.0pt;mso-bidi-font-size: 11.0pt;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family: Calibri;color:black;letter-spacing:.35pt;mso-no-proof:yes"> kiện style="font-size:12.0pt;mso-bidi-font-size:11.0pt;mso-ascii-font-family:Calibri; mso-hansi-font-family:Calibri;mso-bidi-font-family:Calibri;color:black; letter-spacing:.1pt;mso-no-proof:yes"> đó?* chỉ giùm em cách tính tổng nhé. Tổ hợp
* chỉ giùm em cách tính tổng nhé. Tổ hợp
Bài 18: a) Có bao nhiêu số tự nhiên gồm 6 chữ số khác nhau mà tổng các chữ số đó bằng 18? b) Hỏi có bao nhiêu số lẻ thoả mãn điều kiện đó?* chỉ giùm em cách tính tổng nhé.
b) Hỏi có bao nhiêu số lẻ thoả mãn điều kiện đó?* chỉ giùm em cách tính tổng nhé.
* chỉ giùm em cách tính tổng nhé.