railway RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2) Quantitative Aptitude Algebra Identities

જો \((x+\frac{1}{x})\) = 5, અને x > 1, તો  \((x^8-\frac{1}{x^8} )\) નું મૂલ્ય કેટલું છે?

1
\(60605\sqrt{21}\)
2
\(60615\sqrt{21}\)
3
\(60705\sqrt{21}\)
4
\(60725\sqrt{21}\)
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