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If \( \mathrm{n} \) and \( \ell \) are respectively the principal and azimuthal quantum numbers, then the expression for calculating the total number of electrons in any orbit is:
(a) \( \sum_{\ell=1}^{\ell=\mathrm{n}} 2(2 \ell+1) \)
(b) \( \sum_{\ell=1}^{\ell=\mathrm{n}-1} 2(2 \ell+1) \)
(c) \( \sum_{\ell=0}^{\ell=\mathrm{n}+1} 2(2 \ell+1) \)
(d) \( \sum_{\ell=0}^{\ell=\mathrm{n}-1} 2(2 \ell+1) \)
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