PG entrance exam CUET PG 2025 Mock Test Quantitative Aptitude Algebra Quadratic Equation

यदि 5x + 4y = 83 और \(\frac{2 x}{3 y}\) = \(1 \frac{1}{21}\) है, तो x2 - y2 का मान क्या है?

1
83
2
72
3
18
4
4
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