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Three similar wires of frequency n1, n2 and n3 are joined to make one wire. Its frequency will be

(1) $n={n}_{1}+{n}_{2}+{n}_{3}$

(2) $\frac{1}{n}=\frac{1}{{n}_{1}}+\frac{1}{{n}_{2}}+\frac{1}{{n}_{3}}$

(3) $\frac{1}{\sqrt{n}}=\frac{1}{\sqrt{{n}_{1}}}+\frac{1}{\sqrt{{n}_{2}}}+\frac{1}{\sqrt{{n}_{3}}}$

(4) $\frac{1}{{n}^{1}}=\frac{1}{{n}_{1}^{2}}+\frac{1}{{n}_{2}^{2}}+\frac{1}{{n}_{3}^{2}}$