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  2. Four fours - Wikipedia

    en.wikipedia.org/wiki/Four_fours

    For example, when d=4, the hash table for two occurrences of d would contain the key-value pair 8 and 4+4, and the one for three occurrences, the key-value pair 2 and (4+4)/4 (strings shown in bold). The task is then reduced to recursively computing these hash tables for increasing n , starting from n=1 and continuing up to e.g. n=4.

  3. Multiplication sign - Wikipedia

    en.wikipedia.org/wiki/Multiplication_sign

    The multiplication sign (×), also known as the times sign or the dimension sign, is a mathematical symbol used to denote the operation of multiplication, which results in a product. [ 1 ] The symbol is also used in botany , in botanical hybrid names .

  4. Multiplication - Wikipedia

    en.wikipedia.org/wiki/Multiplication

    Area of a cloth 4.5m × 2.5m = 11.25m 2; 4 ⁠ 1 / 2 ⁠ × 2 ⁠ 1 / 2 ⁠ = 11 ⁠ 1 / 4 ⁠ Multiplication (often denoted by the cross symbol, ×, by the mid-line dot operator, ·, by juxtaposition, or, on computers, by an asterisk, *) is one of the four elementary mathematical operations of arithmetic, with the other ones being addition ...

  5. Someone’s Mother Has Four Sons: Try to Solve the Viral Riddle

    www.aol.com/someone-mother-four-sons-try...

    “Someone’s mother has four sons” is how one of the latest viral riddles starts. The answer that seems obvious turns out to be wrong. And the correct answer can elude even the best brains.

  6. Exeter Book Riddle 7 - Wikipedia

    en.wikipedia.org/wiki/Exeter_Book_Riddle_7

    Exeter Book Riddle 7 (according to the numbering of the Anglo-Saxon Poetic Records) [1] is one of the Old English riddles found in the later tenth-century Exeter Book, in this case on folio 103r. The solution is believed to be 'swan' and the riddle is noted as being one of the Old English riddles whose solution is most widely agreed on. [ 2 ]

  7. Ages of Three Children puzzle - Wikipedia

    en.wikipedia.org/wiki/Ages_of_Three_Children_puzzle

    The problem can be presented in different ways, giving the same basic information: the product, that the sum is known, and that there is an oldest child (e.g. their ages adding up to today's date, [3] or the eldest being good at chess [4]).