Two numbers a and b are chosen at random from the set of first 30 natural numbers. The probability that \[{{a}^{2}}-{{b}^{2}}\]is divisible by 3 is

Two numbers a and b are chosen at random from the set of first 30 natu

1.	Two numbers a and b are chosen at random from the set of first 30 natural numbers. The probability that \[{{a}^{2}}-{{b}^{2}}\]is divisible by 3 is
A.	\[\frac{9}{87}\]
B.	\[\frac{12}{87}\]
C.	\[\frac{15}{87}\]
D.	\[\frac{47}{87}\]
Answer» E.

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Two numbers a and b are chosen at random from the set of first 30 natural numbers. The probability that \[{{a}^{2}}-{{b}^{2}}\]is divisible by 3 is

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