UPDATE 1-Liberty Mutual combined ratio worsens to 89.5% as NWP drops 2.8% in Q3

(lede and 3rd para from end updated with correct numbers) * Q3 pre-tax operating income of $2.97 billion, down from $3.1 billion * Combined ratio worsens to 89.5% from 84.7% in the prior period * Cats

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