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यदि `x+y=7` है तो `x^(3)+y^(3)+21xy` का मान क्या होगा?A. 243B. 143C. 343D. 443 |
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Answer» Correct Answer - C `x+y=7` (cubing both sides) `(x+y)^(3)=(7)^(3)` `x^(3)+y^(3)=3(x+y)xy=343` `x^(3)+y^(3)+21xy=343` ` x^(3)+y^(3)+21xy=343` |
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