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Question

Which step in the following problem is wrong?
a=b=1
a=b
step-1: a2=ab
step-2: a2b2=abb2
step-3: (a+b)(ab)=b(ab)
step-4: a + b = b(ab)ab
a+b=b
1+1=1
2=1

A
Step-4
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B
Step-3
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C
Step-2
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D
Step-1
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