Quantitative Aptitude Algebra Identities

 a అనేది ధనాత్మకం మరియు  \({a^2} + \frac{1}{{{a^2}}} = 7,\;{\rm{then\;find}}\:{a^3} + \frac{1}{{{a^3}}}.\)

1
21
2
3√7
3
18
4
7√7

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