This math topic focuses on identifying missing numbers in decreasing arithmetic sequences. It challenges the ability to recognize patterns in sequences where each subsequent number decreases by a constant amount. The problems present sequences with either the first, middle, or last numbers missing, requiring the determination of the correct terms that maintain the established pattern. Each question offers multiple choices, emphasizing the application of arithmetic operations and logical reasoning to solve pattern problems.
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Find the term that would complete this decreasing pattern in the missing space
21, ?, 13, 9, 5