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

যদি x + y = 4 এবং \(\rm \frac{1}{x} + \frac{1}{y} = \frac{16}{15}\) হয়, তাহলে (x3 + y3) -এর মান কত?

1
18
2
19
3
21
4
16
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