Hydrogen has three isotopes (a), (b) and (c). If the number of neutron(s) in (a), (b) and (c) respectively, are (x), (y) and $(\mathrm{z})$, the sum of $(\mathrm{x}),(\mathrm{y})$ and $(\mathrm{z})$ is:

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Hydrogen has three isotopes (a), (b) and (c). If the number of neutron(s) in (a), (b) and (c) respectively, are (x), (y)…

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