find the square of 49 without actual multiplication
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(50-1)^2
(50)^2 + 1^2 - 2*50*1
2500+1-100
2401
(50-1) is better than (40+9)
(50)^2 + 1^2 - 2*50*1
2500+1-100
2401
(50-1) is better than (40+9)
priti49:
10x
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