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  2. Ternary numeral system - Wikipedia

    en.wikipedia.org/wiki/Ternary_numeral_system

    Use of ternary numbers to balance an unknown integer weight from 1 to 40 kg with weights of 1, 3, 9 and 27 kg (4 ternary digits actually gives 3 4 = 81 possible combinations: −40 to +40, but only the positive values are useful) In certain analog logic, the state of the circuit is often expressed ternary.

  3. Combinatorial number system - Wikipedia

    en.wikipedia.org/wiki/Combinatorial_number_system

    The number associated in the combinatorial number system of degree k to a k-combination C is the number of k-combinations strictly less than C in the given ordering. This number can be computed from C = {c k, ..., c 2, c 1} with c k > ... > c 2 > c 1 as follows.

  4. Codabar - Wikipedia

    en.wikipedia.org/wiki/Codabar

    Because Codabar is self-checking, most standards do not define a check digit. [3] Some standards that use Codabar will define a check digit, but the algorithm is not universal. For purely numerical data, such as the library barcode pictured above, the Luhn algorithm is popular. [4] When all 16 symbols are possible, a simple modulo-16 checksum ...

  5. Combination - Wikipedia

    en.wikipedia.org/wiki/Combination

    These combinations (subsets) are enumerated by the 1 digits of the set of base 2 numbers counting from 0 to 2 n − 1, where each digit position is an item from the set of n. Given 3 cards numbered 1 to 3, there are 8 distinct combinations , including the empty set:

  6. Computer number format - Wikipedia

    en.wikipedia.org/wiki/Computer_number_format

    As the number of bits composing a string increases, the number of possible 0 and 1 combinations increases exponentially. A single bit allows only two value-combinations, two bits combined can make four separate values, three bits for eight, and so on, increasing with the formula 2 n. The amount of possible combinations doubles with each binary ...

  7. Keisuke (puzzle) - Wikipedia

    en.wikipedia.org/wiki/Keisuke_(puzzle)

    The best way to start a Keisuke is to look for intersecting digits in the combinations possible within the grid. For example, if the grid shows only one 2-digit/4-digit intersection, and among the 2- and 4-digit numbers, there is only one combination which shares the intersecting digit, the correct values have been found.

  8. What is a credit card security code? - AOL

    www.aol.com/finance/credit-card-security-code...

    Is a credit card security code 3 or 4 digits? Security codes are typically three digits, but it could vary by card network. For example, American Express credit card security codes are four digits.

  9. Lottery mathematics - Wikipedia

    en.wikipedia.org/wiki/Lottery_mathematics

    You would expect to score 3 of 6 or better once in around 36.19 drawings. Notice that It takes a 3 if 6 wheel of 163 combinations to be sure of at least one 3/6 score. 1/p changes when several distinct combinations are played together. It mostly is about winning something, not just the jackpot.