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If y1(x) and y2(x) are two solutions of ...

If `y_1(x)` and `y_2(x)` are two solutions of `dy/dx + f(x) y = r(x)`, then `y_1(x) + y_2(x)` is solution of : (A) `(dy)/dx+f(x)y=0` (B) `(dy)/dx+2f(x)y=r(x)` (C) `(dy)/dx+f(x)y=2r(x)` (D) `(dy)/dx+2f(x)y=2r(x)`

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