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The magnetic moment of electron in an atom(excluding orbital magnetic moment) is given by

$\begin{array}{1 1}(a)\;\sqrt{n(n+2)}\;Bohr\; Magneton(or\;BM)\\(b)\;\sqrt{n(n+1)}BM\\(c)\;\sqrt{n(n+3)}BM\\(d)\;None\;of\;these\end{array}$

The formula for magnetic moment of electron in an atom is $\mu = \sqrt{n(n+2)}\;Bohr\; Magneton(or\;BM)$
Hence (a) is the correct answer.
edited Apr 2, 2014