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1. Ring Z/2Z ,which polynomial is the ideal generated by i+x^2 and 1+x^3
A. 1+x^4
B. x^5+x+1
C. x^6+1

2. an closed associative operater # on set S, a#b#a=b , for any a,b in S
which is correct?
A. # is communicate
B. S is a group
C. S is finite

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