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Question Number 111001 by ZiYangLee last updated on 01/Sep/20

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

Commented by bemath last updated on 01/Sep/20

$$\frac{5}{29}$$

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