Quantitative Aptitude Algebra Identities

જો \(\rm 7a - {7\over a} + 4 = 0\) હોય, તો \(\rm a^3 - {1 \over a^3} - 1\) શોધો.

1
\(-995 \over 343\)
2
\(-875 \over 248\)
3
\(-694 \over 315\)
4
\(-765 \over 262\)

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