A MATHEMATICS TEST CONSISTS OF 3 PROBLEMS, EACH PROBLEM BEING GRAD...

7. - ĐỀ THI OLYMPIC TOÁN TMO VÒNG CÁ NHÂN
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7. A Mathematics test consists of 3 problems, each problem being graded independently with integer points from 0 to 10. Find the number of ways in which the total number of points for this test is exactly 21. Answer : ways