a 
b = a + b + ab
which of the statements is true?
I. a b = b a
II. a 0 = a
III. (a b) c = a (b c)
oa follows
b = a + b + abwhich of the statements is true?
I. a
b = b aII. a
0 = aIII. (a
b) c = a (b c)oa follows
