' (D'ALEMBERT)
      The Pyramid,        .        ,     .         1     ,    1 ,  .  1     (  , , 100 ,  $20),  -    .  (   . 2): 

   
1 - -1 
2 - -3 
3 6 0 
2 - -2 
3 6 +1 

        3-4,            ,     1 .  (. 4): 

   
1 - -1 
2 - -3 
3 - -6 
4 16 +6 
1 ... ... 

   ,       .         ,        . 

-' (CONTRA D'ALEMBERT)
  ,   ,    ,  ,   -  .  (. 2): 

   
1 1 +1 
2 4 +3 
3 6 +6 
4 - +2 
3 ... ... 

 ,      ,    ( ),  . 
