यदि ax = by = cz और b2 = ac है, तो \(\frac{1}{x} + \frac{1}{z}\) का मान क्या है?

1
\(\frac{1}{y}\)
2
\(- \frac{1}{y}\)
3
\(\frac{2}{y}\)
4
\(- \frac{2}{y}\)

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