Each student at State College has a student I.D. number consisting of 3 digits (the first digit is nonzero, and digits may be repeated) followed by 3 of the letters A, B, C, D, and E (letters may not be repeated). How many different student numbers are possible? Answer:

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Ratios

A ratio is a comparison between two numbers of the same kind. It represents how many times one number contains another. It also represents how small or large one number is compared to the other.

Trigonometric Ratios

Trigonometric ratios give values of trigonometric functions. It always deals with triangles that have one angle measuring 90 degrees. These triangles are right-angled. We take the ratio of sides of these triangles.