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Two elements \( A \) and \( B \) have following electronic configuration.
\[
\begin{array}{l}
A=1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} \\
B=1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{3}
\end{array}
\]
\( \mathrm{P} \)
W
If expected compound formed by \( A \) and \( B \) is \( A_{x} B_{y} \) then sum of \( x \) and \( y \) is :
(a) 2
(b) 3
(c) 4
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