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( 0.75 )3 /( 1 - 0.75 ) + [ 0.75 + ( 0.75 )2 + 1 ] का वर्गमूल क्या होगा ?
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सही विकल्प: B
∵ √{ ( 0.75 )3 /( 1 - 0.75 ) + [ 0.75 + ( 0.75 )2 + 1 ] } = ?
∴ √{ ( 0.75 )3 + [ 0.75 + ( 0.75 )2 + 1 ]( 1 - 0.75 ) }/( 1 - 0.75 ) = √{ ( 0.75 )3 + ( 1 )3 - ( 0.75 )3 }/0.25
= √( 1/0.25 ) = √4 = 2
∴ ? = 2
अतः √{ ( 0.75 )3 /( 1 - 0.75 ) + [ 0.75 + ( 0.75 )2 + 1 ] } = 2 होगा ।