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www.reference.com/article/number-combination-calculator-46e3a9243a94157b

A number combination calculator determines the number of possible combinations of a smaller set of numbers from a larger set of numbers. Most graphing calculators have built-in functions to solve for this number. Additionally, several combination calculators are available online at CalculatorSoup.co

www.reference.com/article/can-use-special-calculator-figure-out-combinations-9bf3621a1695d564

MathIsFun.com and StatTrek.com offer free online calculators that figure out combinations. Combinations are sets of numbers or objects that are chosen and placed in no particular order.

www.reference.com/business-finance/variation-order-30dcdacd0e7a7348

A variation order is a change, often in construction, that modifies all or part of an existing order. Many construction projects undergo changes, especially after the beginning of building, and the cost impact on a construction project with a variation order can be costly.

www.reference.com/article/natural-variation-c6cacbed6f186cf1

Natural variations, also known as genetic variations, are mutations that randomly occur during sex cell division. These variations lead to different phenotypes that change an offspring's ability to survive and reach sexual maturity.

www.reference.com/article/direct-variation-1def427678cd9cb7

The term "direct variation" refers to a mathematical correlation between two variables where one variable can be represented as a constant multiple of the other unknown quantity. It is also known as a "direct proportion."

www.reference.com/article/constant-variation-cb00f5348d527795

The constant of variation is a number that relates two variables that are directly proportional to one another. The number represents a fixed ratio between the two variables, describing how they correspondingly increase or decrease. Constants of variation cannot be calculated for linear expressions

www.reference.com/article/letter-variations-106e8744de47abcc

Letters typically feature a variety of variations depending on where they are used. Vowels are commonly altered between dialects, and many different languages have their own variations of common English alphabet letters based on context.

www.reference.com/article/variation-science-60ca47514e6836cb

Variation, a term in genetic science, refers to a genetic change that causes differing characteristics between organisms in a certain species. Much of the variation within and between species is due to differential regulation of genes and alleles. Gene alleles determine distinct traits passed on fro

www.reference.com/article/direct-variation-formula-3b04e36c4c6efd42

The general formula for direct variation is k equals y divided by x. In this formula, k is a constant quantity and x and y are variables. K is also called the constant of variation, because it stays the same even as x and y vary.

www.reference.com/world-view/cultural-variation-1f15c91134b45f57

Cultural variation refers to the differences in social behaviors that different cultures exhibit around the world. What may be considered good etiquette in one culture may be considered bad etiquette in another.