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

જો x + y = 4 અને \(\rm \frac{1}{x} + \frac{1}{y} = \frac{16}{15}\) તો પછી (x3 + y3) ની કિંમત કેટલી છે?

1
18 
2
19 
3
21 
4
16 
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