问答题If a is an integer, is b an integer?  (1) The average (arithmetic mean) of a and b is an integer.  (2) The average (arithmetic mean) of a, b, and b+4 is a.

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问答题
If a is an integer, is b an integer?  (1) The average (arithmetic mean) of a and b is an integer.  (2) The average (arithmetic mean) of a, b, and b+4 is a.

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