A differential equation associated with the primitive \[y=a+b{{e}^{5x}

1.	A differential equation associated with the primitive \[y=a+b{{e}^{5x}}+c{{e}^{-~7x}}\] is
A.	\[{{y}_{3}}+2{{y}_{2}}-{{y}_{1}}=0\]
B.	\[{{y}_{3}}+2{{y}_{2}}-35{{y}_{1}}=0\]
C.	\[4{{y}_{3}}+5{{y}_{2}}-20{{y}_{1}}=0\]
D.	None of these
Answer» C. \[4{{y}_{3}}+5{{y}_{2}}-20{{y}_{1}}=0\]

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A differential equation associated with the primitive \[y=a+b{{e}^{5x}}+c{{e}^{-~7x}}\] is

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