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In a basis in which the z-component S of the spin is diagonal, an electron is in a spm state
(1+i)//6
2/3
The probabilities that a measurement of S, will yield the values ħ/2 and -h/2 are, respectively
(a) 1/2 and 1/2
(b) 2/3 and 1/3
(c) 1/4 and 3/4
(d) 1/3 and 2/3

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