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Friday, March 25, 2011

THE NUMBER 13

 Two interesting facts about the number 13: 

(i)  (1 / 13 )   =     0.076923076923076923076923...
                 (rational periodic infinite decimal)

    On multiplying the periodic number 76923 by successive multiples of 13, the following curious numerical pattern is obtained.
    76923 * 013 = 0999999
    76923 * 026 = 1999998 
    76923 * 039 = 2999997 
    76923 * 052 = 3999996
    76923 * 065 = 4999995
    76923 * 078 = 5999994
    76923 * 091 = 6999993
    76923 * 104 = 7999992
    76923 * 117 = 8999991
    76923 * 130 = 9999990



     (ii) The numerical pattern abcabc is divisible by 13.

      Friday, February 4, 2011

      An interesting fact about the powers of 10



      There seems to be only 11 powers of ten that are products of 2 integers without any zero digits.



      10 ^ 0     =                      1 * 1
      10 ^ 1     =                      2 * 5
      10 ^ 2     =                      4 * 25
      10 ^ 3     =                      8 * 125
      10 ^ 4     =                      6 * 625
      10 ^ 5     =                    32 * 3125 
      10 ^ 6     =                    64 * 15625
      10 ^ 7     =                  128 * 78125
      10 ^ 9     =                  512 * 1953125 
      10 ^ 18   =             262144 * 3814697265625 
      10 ^ 33   =      8589934592 * 116415321826934814453125

      Tuesday, November 2, 2010

      CHOCOLATE PUZZLE

      A shop sells chocolates @ Re.1 each. You can exchange 3 wrappers for 1 chocolate.


      If you have Rs.15/- how many chocolates can you get totally????
       
       
      Find the solution..
       
      TO CHECK YOUR ANSWER ... SCROLL DOWN
       
       
       FOR MORE PUZZLES CLICK HERE
       
       
       
       
       
       
       
       
       
       
       
       
       
       
       
       
       
       
       
       
       
       
       
       

       
       
       
       
       
       
      SOLUTION:
       
      22 CHOCOLATES

       for  15 rupees you get 15 chocolates.
      on returning 15 wrappers you get 5  chocolates.
      on returning 3 wrappers  (keeping two wrappers in hand) you get 1 chocolate.
      now this one  chocolate. wrapper and the twp wrapers you had will add on three.
      atlast on returning 3 wrappers you get 1 chocolate.


      i.e.,   15+5+1+1 = 22

      Monday, August 30, 2010

      MATHS AND NATURE

      "The laws of nature are but the mathematical thoughts of God"
                                                                                            - Euclid

      Mathematics is everywhere in this universe. We seldom note it. We enjoy nature and are not interested in going deep about what mathematical idea is in it. Here are a very few properties of mathematics that are depicted  in nature.
      SYMMETRY

      Symmetry is everywhere you look in nature .

      Symmetry is when a figure has two sides that are mirror images of one another. It would then be possible to draw a line through a picture of the object and along either side the image would look exactly the same. This line would be called a line of symmetry.

      There are two kinds of symmetry.

      One is bilateral symmetry in which an object has two sides that are mirror images of each other.

      The human body would be an excellent example of a living being that has bilateral symmetry.




      Few more pictures in nature showing bilateral symmetry.










      The other kind of symmetry is radial symmetry. This is where there is a center point and numerous lines of symmetry could be drawn.

      The most obvious geometric example would be a circle.



      Few more pictures in nature showing radial symmetry.























      SHAPES

      Geometry is the branch of mathematics  that describes shapes.

      Sphere:

      A sphere  is a perfectly round geometrical object in three-dimensional space, such as the shape of a round ball.

      The shape of the Earth is very close to that of an oblate spheroid, a sphere flattened along the axis from pole to pole such that there is a bulge around the equator.






















      Hexagons:

      Hexagons are six-sided polygons, closed, 2-dimensional, many-sided figures with straight edges.

       
      For a beehive, close packing is important to maximise the use of space. Hexagons fit most closely together without any gaps; so hexagonal wax cells are what bees create to store their eggs and larvae.
















      Cones:

      A cone is a three-dimensional geometric shape that tapers smoothly from a flat, usually circular base to a point called the apex or vertex.

      Volcanoes form cones, the steepness and height of which depends on the runniness (viscosity) of the lava. Fast, runny lava forms flatter cones; thick, viscous lava forms steep-sided cones.















      Few more cones in nature:

































      Parallel lines:

      In mathematics, parallel lines stretch to infinity, neither converging nor diverging.

      These parallel dunes in the Australian desert aren't perfect - the physical world rarely is.

















      Fibonacci spiral:

      If you construct a series of squares with lengths equal to the Fibonacci numbers (1,1,2,3,5, etc) and trace a line through the diagonals of each square, it forms a Fibonacci spiral.

      Many examples of the Fibonacci spiral can be seen in nature, including in the chambers of a nautilus shell.




       
       
       
       
       
       
       
       
       
       
       
       

      Thursday, July 29, 2010

      VAMPIRE NUMBER

      The vampire numbers were introduced by Clifford A. Pickover in 1994.

      A Vampire number z  is a number which can be written as a product of two numbers x and y  containing the same digits the same number of times as the vampire number. Here x and y are called FANGS.

      FOR EXAMPLE:

      1827 can be written as a product of two numbers 21 and 87.
      i.e., 1827 = 21 * 87
      Here the digits 1,8, 2,7 are repeated  the same number of times but in different order. 21 and 87 are called fangs.

      A true Vampire number isa number which can be written with 2 fangs having the same number of digits not both ending in zero.

      FOR EXAMPLE :

      1260 is a vampire number, with 21 and 60 as fangs, since 21 × 60 = 1260. However, 126000 – 210 × 600 – is not, as both 210 and 600 have trailing zeroes.

      All vampire numbers must clearly have an no. of digits.


      Some vampire numbers:
       117067 = 167*701
      124483 = 281 * 443
      536539 = 563 · 953
      23287176 = 2673 * 8712.




      Vampire number having two distinct pairs of fangs :


      125460 = 204 *615 = 246 * 510

      Vampire number having three distinct pairs of fangs :

      13078260 = 1620*8073 = 1863*7020 = 2070*6318