(50-1)(50+1)=50^2-1^2=2500-1=2499
49*51=(50-1)*(50+1)=50²-1=2500-1=2499
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(50-1)(50+1)=50^2-1^2=2500-1=2499
49*51=(50-1)*(50+1)=50²-1=2500-1=2499