Generate a short summary: a nato soldier and three afghan security personnel were killed in a string of explosions and ambushes linked to a taliban-led insurgency , security officials said monday .
Answer: nato soldier three afghans killed in attacks

Generate a short summary: china 's top female triathlete wang hongni has been banned for two years for doping , which will keep her out of next year 's beijing olympics .
Answer: china triathlete banned after positive doping test

Generate a short summary: british telecommunications behemoth bt group announced wednesday an aggressive price war on fixed-line call costs , in an attempt to hang on to its dominant market position .
Answer:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
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britain 's bt launches aggressive telecoms price war