railway RRB JE (CBT I + CBT II) Mock Test 2024 Quantitative Aptitude Algebra Identities

यदि \(x+\frac{81}{x}=18\) है, जहाँ x > 0 है, तो \(x^2+\frac{162}{x^2}\) का मान है:

1
85
2
81
3
78
4
83
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