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Below reaction sequence illustrates the various stages of reduction of nitric acid where a, b, c, d are the number of electrons involved in the reduction of 1 mole N-
P atoms.

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\[
\begin{array}{r}
\underset{\mathrm{He}^{-}}{\longrightarrow} \underset{\mathrm{He}^{-}}{\longrightarrow} \mathrm{NH}_{3}
\end{array} \mathrm{NO}_{2} \underset{\mathrm{be}^{-}}{\longrightarrow} \mathrm{NO} \underset{\mathrm{ce}^{-}}{\longrightarrow} \mathrm{N}_{2} \mathrm{O}
\]
Find the value of \( (2 a+b+3 c-d) \).
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