a: let's iterate over the elements in the set x to make new set
2∗0=02*0=02∗0=0 , 2∗1=22*1=22∗1=2 , 2∗2=42*2=42∗2=4
it means set is {0, 2, 4}
b: let's iterate over the elements in the set x to make new set
0+0=0,0+1=1,0+2=2,0+0=0, 0+1=1,0+2=2,0+0=0,0+1=1,0+2=2,
1+1=2,1+2=3,2+2=41+1=2,1+2=3,2+2=41+1=2,1+2=3,2+2=4
it means set is {0, 1, 2, 3, 4}
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