જો x 2 + y 2 = 106 અને x - y = 4 હોય, તો \(\rm \frac{1}{x}-\frac{1}{y}\) ની કિંમત છે:

1
\(\frac{16}{45}\)
2
\(-\frac{16}{45}\)
3
\(\frac{4}{45}\)
4
\(-\frac{4}{45}\)

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