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www.reference.com/math/complement-math-7a6dde1fef0bbabe

What Is a Complement in Math? The complement is all the other answers besides the one that is wanted , which is known as the event. Together, the event and complement cover all possible outcomes. When trying to find the probability of something, all possible outcomes need to be determined. The outcomes are not what the problem solver wants to ...

www.mathsisfun.com/definitions/complement.html

Together the set and its complement make the Universal set. Another Example: In the set below the Universal set is {alex, blair, casey, drew, erin, francis, glen, hunter, ira, jade} and the complement of set "S" is:

www.mathopenref.com/complement.html

The complement is the amount you must add to something to make it "whole". For example, in geometry, two angles are said to be complementary when they add up to 90°. One angle is said to be the complement of the other.

A complement is any word or phrase that completes the sense of asubject, an object, or a verb. Don't mistake a subject complement for a direct object, only linking verbs can have subject complements..

en.wikipedia.org/wiki/Complement_(set_theory)

If A is the set of odd numbers, then the complement of A is the set of even numbers. If B is the set of multiples of 3, then the complement of B is the set of numbers congruent to 1 or 2 modulo 3 (or, in simpler terms, the integers that are not multiples of 3). Assume that the universe is the standard 52-card deck.

mathcentral.uregina.ca/qq/database/qq.09.06/h/gretchen1.html

Math Central: Quandaries & Queries: Question from Gretchen, a student: An angle is its own complement. Find the measure of a suppllement to this angle. Gretchen, If you have an angle and want to know its complement, you subtract it from 90 degrees. What angle, when subtracted from 90 degrees, gives the same value?

Here we see how to do subtraction using addition! (I don't recommend this for normal subtraction work, but it is still a valid and interesting way to subtract. And in some cases it may save time.) The "complement" is the number to add to make 10 (or 100, 1000, etc, depending on how many digits we ...

www.mathsisfun.com/data/probability-complement.html

So the Complement of an event is all the other outcomes (not the ones we want).. And together the Event and its Complement make all possible outcomes. Probability. Probability of an event happening = Number of ways it can happenTotal number of outcomes