16. 阿雄射五枝飛標,其分數只有三種,5、3、1分,則他的總分有幾種可能?
(A)8
(B)9
(C)10
(D)11
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統計: A(21), B(58), C(78), D(173), E(0) #2130394
統計: A(21), B(58), C(78), D(173), E(0) #2130394
詳解 (共 5 筆)
#4152892
1,1,1,1,1 =5
1,1,1,1,3 =7
1,1,1,3,3 =9
1,1,3,3,3 =11
1,3,3,3,3 =13
3,3,3,3,3 =15
1,1,5,5,5 =17
1,5,5,5,5 =21
5,5,5,5,5 =25
1,3,5,5,5 =19
3,5,5,5,5 =23
總分共有11種可能
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#6524728
用「枚舉」法計算所有可能的得分組合:
設:
-
a:得5分的鏢數
-
b:得3分的鏢數
-
c:得1分的鏢數
根據條件:
a+b+c=5總分=5a+3b+1c
枚舉所有組合與總分:
| a (5分) | b (3分) | c (1分) | 總分 = 5a + 3b + c |
|---|---|---|---|
| 0 | 0 | 5 | 0 + 0 + 5 = 5 |
| 0 | 1 | 4 | 0 + 3 + 4 = 7 |
| 0 | 2 | 3 | 0 + 6 + 3 = 9 |
| 0 | 3 | 2 | 0 + 9 + 2 = 11 |
| 0 | 4 | 1 | 0 + 12 + 1 = 13 |
| 0 | 5 | 0 | 0 + 15 + 0 = 15 |
| 1 | 0 | 4 | 5 + 0 + 4 = 9 |
| 1 | 1 | 3 | 5 + 3 + 3 = 11 |
| 1 | 2 | 2 | 5 + 6 + 2 = 13 |
| 1 | 3 | 1 | 5 + 9 + 1 = 15 |
| 1 | 4 | 0 | 5 + 12 + 0 = 17 |
| 2 | 0 | 3 | 10 + 0 + 3 = 13 |
| 2 | 1 | 2 | 10 + 3 + 2 = 15 |
| 2 | 2 | 1 | 10 + 6 + 1 = 17 |
| 2 | 3 | 0 | 10 + 9 + 0 = 19 |
| 3 | 0 | 2 | 15 + 0 + 2 = 17 |
| 3 | 1 | 1 | 15 + 3 + 1 = 19 |
| 3 | 2 | 0 | 15 + 6 + 0 = 21 |
| 4 | 0 | 1 | 20 + 0 + 1 = 21 |
| 4 | 1 | 0 | 20 + 3 + 0 = 23 |
| 5 | 0 | 0 | 25 + 0 + 0 = 25 |
ㅤㅤ
所有可能的總分:
{5,7,9,11,13,15,17,19,21,23,25}共:11種不同總分
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