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Comprehension XII
Suppose a particle has four quantum numbers such that the permitted values are \( n=1,2,3 \ldots \ldots \) \( l=(n-1),(n-3),(n-5), \ldots \), but no negative value \( j=\left(l+\frac{1}{2}\right) \) or \( \left(l-\frac{1}{2}\right) \), the latter is not negative \( m=-j \) in integer step to \( +j \).
For \( n=3 \), the possible sets of \( (n, l, j, m) \) is
(a) 10
(b) 8
(c) 12
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