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Find the square of the following numbers without actual multiplication.(i) 39 (ii) 42

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Find the square of the following numbers without actual multiplication.(i)             39          (ii)     42
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(i) `39^2 = 39**39 = (40-1)(40-1)`
`1600-40-40+1 = 1521`
(ii)`42^2 = 42**42 = (40+2)(40+2)`
`1600+80+80+4 = 1764`
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