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The value of $\begin{vmatrix} (a+1)(a+2) & a+2 & 1 \ (a+2)(a+3) & a+3 & 1 \ (a+3)(a+4) & a+4 & 1 \end{vmatrix}$ is
(1) $-2$
(2) $(a+1)(a+2)(a+3)$
(3) $0$
(4) $(a+2)(a+3)(a+4)$
BETA
