Which of the following expressions can be used to represent all odd numbers greater than or equal to 1, where a ≥ 1?

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The CLEP College Mathematics exam covers material generally taught in a college course for non-mathematics majors. Exam contents: (with weightage) Algebra and Functions (20%) Solving equations, linear inequalities, and systems of linear equations by analytic and graphical methods Interpretation, representation, and evaluation of functions: numerical, graphical, symbolic, and descriptive methods Graphs of functions: translations, horizontal and vertical reflections, and symmetry about the x-axis, the y-axis, and the origin Linear and exponential growth Applications Counting and... Show more

Which of the following expressions can be used to represent all odd numbers greater than or equal to 1, where a ≥ 1?