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Solution
The correct option is C(n−2)f1−14(n−1)d0−1ns2, n=6 Lanthanides, n=7 Actinides (n−2)f1−14(n−1)d0−1ns2, n=6 Lanthanides, n=7 Actinides is the general electronic configuration of lanthanides and actinides respectively.