using indenty slove 297 × 303
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297 × 303 = ( 300 - 3 )( 300 + 3 )
= (300)² - (3)² [ (a+b)(a-b) = a² - b² ]
= 90000 - 9 = 89991
= (300)² - (3)² [ (a+b)(a-b) = a² - b² ]
= 90000 - 9 = 89991
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