Of the three-digit positive integers whose three digits are all d

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Of the three-digit positive integers whose three digits are all different and nonzero, how many are odd integers greater than 700?

A、84.0
B、91.0
C、100.0
D、105.0
E、243.0

答案：B

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可以讲一下吗

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可以再解释下个位数的数字么？对于700的个位数为什么不是3呢？个位不能024687所以9-6=3，所以为什么不是1*7*3呢

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老师，这道题为什么不是3*10*5呀。百位是7、8、9。十位是任意10个数。个位是1、3、5、7、9

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