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B
3√10−2√570
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C
3√10+2√550
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D
none of these
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Solution
The correct option is C170(3√10+2√5) Given, 1√40+√20+√10−√80 =12√10+2√5+√10−4√5 =13√10−2√5 Multiplying and dividing by 3√10+2√5 =3√10+2√590−20 =3√10+2√570