in haskell: Write a function sumNums that adds the items in a list and returns a list of the running totals. For example:  sumNums [2,3,4,5] returns [2,5,9,14].

Database System Concepts
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Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
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in haskell:

Write a function sumNums that adds the items in a list and returns a list of the running totals. For example:  sumNums [2,3,4,5] returns [2,5,9,14]. 

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