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You are watching: Find a + b, 9a + 7b, |a|, and |a − b|. a = 9i − 8j + 7k, b = 7i − 9k


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A: Given series:∑k=1∞k!2k+1!Ratio test:Let ∑an be the collection and define L=limn→∞an+1anThen,1) If ...