# is one of the ways of adding, subtracting, multiplying and dividing. What kind of operation does # represent?
1: a*(a#a)=0 is true for any a.
2: a#(b#c)=(a#b)#c
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AStatement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
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BStatement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
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CBoth statements TOGETHER are sufficient, but NEITHER one ALONE is sufficient.
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DEACH statement ALONE is sufficient.
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EStatements (1) and (2) TOGETHER are NOT sufficient.
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正确答案: A