1. In how many ways can 2 novels, 3 mathematics textbooks, and 2 chemistry books be arranged on a bookshelf if the mathematics books must be together and the chemistry books must be together? 2. Suppose that 75% of senior citizens invest in annuities and 45% of senior citizens invest in the stock market. If 85% of senior citizens invest the the stock market and/or annuities, what percentage invest in both?

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