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यदि `x^(3)+y^(3)=35` और `x+y=5` है तो `1/x+1/y` का मान क्या होगा?A. `1/3`B. `5/6`C. `6`D. `2/3` |
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Answer» Correct Answer - B `x^(3)+y^(3)=35` `implies x+y=5` Take cube on both sides `(x+y)^(3)=(5)^(3)` `x^(3)+y^(3)+3xy(x+y)=125` `35+3xy(5)=125` `15xy=125-35` `15xy=90` `xy=6` `:. 1/x+1/y=(x+y)/(xy)=5/6` |
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