If one number is selected from the first 70 natural numbers, the probability that the number is ...

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If one number is selected from the first 70 natural numbers, the probability that the number is a solution of \( x^{2}+2 x4 \) is
(a) \( \frac{69}{70} \)
(b) \( \frac{1}{70} \)
(c) 1
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