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$a) He \: Wrote, \: \\ \sqrt{1764} = 4×9×19\\ Instead \: Of \: writing \\ \sqrt{1764} = \underline{2 \times 2 } \: \underline{\times 3 \times 3} \: \underline{\times 7 \times 7} \\ \sqrt{1764} = 2 \times 3 \times 7 \\ = 42$

$\sf \: Correct \: Statement \: Will \: Be :-\\ \sqrt{1764} = \underline{2 \times 2 } \: \underline{\times 3 \times 3} \: \underline{\times 7 \times 7} \\ \sqrt{1764} = 2 \times 3 \times 7 \\ = 42$