Two natural numbers \( a \) and \( b \) are selected at random. The...

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Two natural numbers \( a \) and \( b \) are selected at random. The probability that \( a^{2}+b^{2} \) is divisible by 7 is
(a) \( 3 / 8 \)
(b) \( 1 / 7 \)
(c) \( 3 / 49 \)
(d) \( 1 / 49 \)
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