                         .

                             1.
     ந ,  뤠騩  ७  ⠭
N ᥫ.

                             2.
     ஢  ⢠  n-⭮ -
 {0, ..., n-1}.

                             3.
     ஢   k- ⢠ ⢠ A  N
ᥫ, A={1, 2, ..., N}.
     ਬ: N=3, k=2,
             ⢠ {1,2}, {1,3}, {2,3}.

                            4.1.
      ६    窠    
 㪢  ஬  ᪮ 䠢   稫    
    "211221-21221".  । 㤠  㤠  -
?

                            4.2.
      ப S   A ᫮ [1],  ..., A[k].  ப
S  ᫮  ᥬ 묨 ᯮᮡ.
     ਬ: S=ABBC
             A[1]=A, A[2]=AB, A[3]=BC, A[4]=BBC, A[5]=H, A[6]=B
     S = A B BC
       = A BBC
       = AB BC
     
                            4.3.
      ⪠ ⠡ ⠢ ᫠.  ⠢   -
  K  ৥  ⠪,  ⮡     㣠    ⮡ 㬬
ᥫ,  뢠, 뫠 ᨬ쭮.

                             5.
      N  祪      ࠢ  몫뢠 
 楯,  稭  窨,  ࠭ ந쭮,  
   ,   . ந , -
騩 । ⠪ ਠ 몫뢠   祪,  
஬  ,  楯窠    த, " -
" ⠭ ᨬ쭮 ᫮ 窮.

                              6.
     a)  ᠭ ࠦ ((((1?2)?3)?4)?5)?6   
  ?  ⠢    4 䬥᪨ 権 +,-,*,/
⠪,  ⮡ १ ᫥ ࠢ 35 (   ஡
  ⭮ 뢠).   襭.
     )  ப   祬  6    ஥  楫
᫮ R.  ⠢  䬥᪨ 権 ("+", "-", "*",
"/";     㭠,  ..    -
⥫쭮 ᫠;     楫, .. 11/3=3)  -
뢠騥  뢠騥 㣫 ᪮ ⠪,  ⮡     -
 ᫥ 稢襣 ࠦ ᫮ R.  譨 -
 ᪮ 訡  .
      ਬ: ப 505597, R=120: ((5+0)*((5*5)-(9/7)))=120.

                             7.
     ந   ᫮  n>0  䠢 ᪮ "("  ")",
।⠢騥 ࠢ ᪮ .

                             8.
      ⠢ ணࠬ,       ⠥      ࠧ
।⠢ ᫠ N   ᥢ  ந  (㬬)  K
ࠫ ᥫ (N, K-, 1<K<N ). ᫨ =0,  뤠 
 ந (㬬). ।⠢ ᥫ,  ⫨
⮫쪮 浪 ᮬ⥫ (᫠),  묨.
