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A shelf has 4 books, of which 2 are of science and 2 are of social studies. In how many wayscan we select 3 books

A shelf has 4 books, of which 2 are of science and 2 are of social studies. In how many wayscan we select 3 books from the shelf such that we have atleast one science book and atleastone social studies book ?A) 7B) 8C) 4D) 6

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