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单选题
1, 2, 6, 7, 9A three-digit integer is to be formed from the digits listed above. If the first digit must be odd, either the second or the third digit must be 2, and no digit may be repeated, how many such integers are possible?
A
6
B
9
C
18
D
24
E
30
参考答案
参考解析
解析：
因为第一个数字有两种选择7和9。第二位数字有两种选择，第三位数字有一种选择，所以共有3×2×3 =18种可能性。
因为第一个数字有两种选择7和9。第二位数字有两种选择，第三位数字有一种选择，所以共有3×2×3 =18种可能性。
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