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单选题
a and b are positive, a is even and b is odd. Which of the following must also be odd?
A
ab
B
a/b
C
a + 2b
D
ba
E
(ab) a
参考答案
参考解析
解析：
An odd number raised to an even power equals an odd number. Take 32 = 9, for example, ba is the correct answer.
An odd number raised to an even power equals an odd number. Take 32 = 9, for example, ba is the correct answer.
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