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यदि $a, b, c$ समांतर श्रेढ़ी में हों तो सारणिक $\left|\begin{array}{lll} x+2 & x+3 & x+2 a \\ x+3 & x+4 & x+2 b \\ x+4 & x+5 & x+2 c \end{array}\right|$ का मान होगा: