If x + y = 7 and x² + y² = 29 then what is xy?
यदि x + y = 7 और x² + y² = 29 हो तो xy का मान क्या होगा?
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Correct Answer
C. 10 / 10
ExplanationUsing (x + y)² = x² + y² + 2xy gives 49 = 29 + 2xy so xy = 10.
(x + y)² = x² + y² + 2xy से 49 = 29 + 2xy इसलिए xy = 10।