Nuh عليه السلام Lived For 950 Years?
The use of سنة and عام in the same sentence is to avoid repetition of the same word when it sounds not good and serve no purpose. Also, in Arabic, the former is used for period of trial and troubles and the latter for relief and prosperity. we can assume the it tells that 950 years of Noah’s preaching were very hard on him while the rest of the 50 years which he did not have to spend were a relief.