Which of the following sequences is correct as per aufbau principle? [DPMT 2005] (a) \( 3 s3 d4 ...

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Which of the following sequences is correct as per aufbau principle?
[DPMT 2005]
(a) \( 3 s3 d4 s4 p \)
(b) \( 1 s2 p4 s3 d \)
(c) \( 2 s5 s4 p5 d \)
(d) \( 2 s2 p3 d3 p \)
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