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Examples of Mathematics

Imaginary numbers Posted on 2011-03-22 00:18:45

An imaginary number is a number that gives a negative result when squared.
Imaginary numbers are represented with the letter i, which stan...Real numbers Posted on 2011-03-22 00:14:38

A real number is any element of the set R, which is the union of the set of rational numbers and the set of irrational numbers.
Examples o...Rational and irrational numbers Posted on 2011-03-22 00:10:58

A rational number is any ordinary number of arithmetic: Any whole number, fraction, mixed number or decimal; together with its negative ima...Combination problems Posted on 2011-03-22 00:04:55

In permutations, the order is all important -- we count abc as different from bca. But in combinations we are concerned only that a, b, and...Permutations of less than all Posted on 2011-03-22 00:01:06

A permutation is an arrangement in which order is important. The notation for permutations is P(n,r) which is the number of permutations of ...Factorials Posted on 2011-03-21 00:08:04

A factorial is designated by a positive whole number followed by an exclamation point (e.g. 8!). The value of a factorial is the product of ...Supplementary Angles Posted on 2011-02-10 10:16:24

Two angles are supplementary if the sum of their angles equals 180º.
If one angle is known, its supplementary angle can be found by subtract...Complementary Angles Posted on 2011-02-10 10:15:29

Two angles are complementary if the sum of their angles equals 90º.
If one angle is known, its complementary angle can be found by subtracti...Find Third Angle of a Triangle Posted on 2011-02-10 10:14:45

The sum of the interior angles of a triangle are equal to 180º. To find the third angle of a triangle when the other two angles are known su...Simple Probability Posted on 2011-02-01 19:15:43

One example of simple probability:
There are 87 marbles in a bag and 68 of them are green. If one marble is chosen, what is the probability...Combinations Posted on 2011-02-01 19:14:18

A combination is an arrangement in which order is NOT important.
The notation for combinations is C(n,r) which is the number of combinations...Permutations Posted on 2011-02-01 19:13:34

A permutation is an arrangement in which order is important. The notation for permutations is P(n,r) which is the number of permutations of ...Factorial Posted on 2011-02-01 19:13:01

A factorial is designated by a positive whole number followed by an exclamation point (e.g. 8!). The value of a factorial is the product of ...Time zones in North America Posted on 2011-02-01 19:06:19

Examples of time zones in North America:
Time Zone - Standard Time Summer Time
Atlantic - 12:00 - 1:00
Eastern - 11:00 - 12:00
Central - 1...Time zones in Europe Posted on 2011-02-01 19:05:38

Examples of time zones in Europe (Continental):
Time Zone - Standard Time Summer Time
Greenwich Mean Time - 12:00 - 1:00
Western Europe Ti...