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  2. Size of groups, organizations, and communities - Wikipedia

    en.wikipedia.org/wiki/Size_of_groups...

    The number of possible person-to-person links (L) increases rapidly as the size of the group (N) increases (L = (N² - N) /2). In a four-member group there are six possible pairings; add a fifth member for each of the four to relate to and you have ten pairs. The number of possible two-person links in a group of twelve is 66.

  3. Category:Quartets - Wikipedia

    en.wikipedia.org/wiki/Category:Quartets

    Category for quartets or groups of four. See also Groups of Chinese people; Groups of ancient Greeks; Groups of ancient Romans; Subcategories duos, trios, quartets ...

  4. Types of social groups - Wikipedia

    en.wikipedia.org/wiki/Types_of_Social_Groups

    As such, primary groups or lack thereof [citation needed] play an important role in the development of personal identity, and can be understood as tight circles composed of people such as family, long-term romances, crisis-support group, church group, etc. [4] The concept of the primary group was first introduced in 1909 by sociologist Charles ...

  5. 4 - Wikipedia

    en.wikipedia.org/wiki/4

    The smallest non-cyclic group has four elements; it is the Klein four-group. [15] A n alternating groups are not simple for values n {\displaystyle n} ≤ 4 {\displaystyle 4} . There are four Hopf fibrations of hyperspheres :

  6. List of country groupings - Wikipedia

    en.wikipedia.org/wiki/List_of_country_groupings

    Arraiolos Group is an informal meeting of presidents of parliamentary and semi-presidential European Union member states. ASEAN: the Association of Southeast Asian Nations, a regional organisation comprising ten Southeast Asian states; ASEAN+3: the ASEAN countries, plus China, Japan, and the Republic of Korea (South Korea). [4]

  7. Tetralogy - Wikipedia

    en.wikipedia.org/wiki/Tetralogy

    A tetralogy (from Greek τετρα- tetra-, "four" and -λογία -logia, "discourse") is a compound work that is made up of four distinct works.The name comes from the Attic theater, in which a tetralogy was a group of three tragedies followed by a satyr play, all by one author, to be played in one sitting at the Dionysia as part of a competition.

  8. AOL Mail

    mail.aol.com

    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  9. 4-bit computing - Wikipedia

    en.wikipedia.org/wiki/4-bit_computing

    4-bit computing is the use of computer architectures in which integers and other data units are 4 bits wide. 4-bit central processing unit (CPU) and arithmetic logic unit (ALU) architectures are those that are based on registers or data buses of that size. A group of four bits is also called a nibble and has 2 4 = 16 possible values, with a ...