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A fires 5 shots to B s 3 but A kills ...

`A` fires 5 shots to `B` s 3 but `A` kills only once in 3 shots while `B` kills once in 2 shots. When `B` has missed 27 times, `A` has killed (a) 30 birds (b) 60 birds (c) 72 birds (d) 90 birds

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