Find the least number which must be subtracted from 402 so as to get a perfect square. also find the square root of the perfect square so obtained.
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(i) 402 (ii) 1989 (iii) 3250 (iv) 825(v) 4000. So, if we subtract 2 from 402, we get a perfect square and square root of the perfect square will be 20.
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