The number of value of \( c \) for which \( y=5 x+c \) is a tangent...

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The number of value of \( c \) for which \( y=5 x+c \) is a tangent to the ellipse \( \frac{x^{2}}{25}+y^{2}=1 \) is
(a) 1
(b) 2
(c) 4
(d) 6
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