Probability-4

Discrete Mathematics Level pending

A hunter's chace of shotinng an animal at a distance $$'r'$$ is $$\frac{a^2}{r^2}$$ (r greater than a).He fires when $$r=2 a$$ and if he misses he reloads & fire when $$r=3 a ,4 a, ...$$ .If he misses at a distance $$'n a'$$ ,the animal escapes. The odds against the hunters are $$\frac{n+a}{n-b}$$.Then value of $$a+b$$

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