(a) Two natural numbers \( x \) and \( y \) are chosen at random. Find the probability that \( x...

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(a) Two natural numbers \( x \) and \( y \) are chosen at random. Find the probability that \( x^{2}+y^{2} \) is divisible by 10 .
\( P \)
(b) Two numbeis \( x \& y \) are chosen at random from the set \( \{1,2,3,4, \ldots .3 n\} \). Find the probability that
W \( x^{2}-y^{2} \) is divisible by 3 .
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