2 Answers
মনে করি,
a=b
বা, a2=ab
বা, a2-b2=ab-b2
বা, (a+b)(a-b)=b(a-b)
বা, a+b=b
বা, b+b=b [a=b]
বা, 2b=b
বা, 2=1
বা, 2-1=1-1
বা, 1=0
বা, 1*12=0*12
বা, 12=0
বা, 12+1=0+1
বা, 13=1
বা, 11+2=1
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