175*175 + 2 *175 *125 + 125 *125 is equal to *
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( a + b ) ² = a² + 2ab + b² .
= ( 175 )² + 2 ( 175 ) ( 125 ) + ( 125 )².
= ( 175 + 125 ) 2 .
= ( 200 )² .
= 40000 .
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