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1.

program test;

var i,k2,k3,k4,k5:integer;

a:array [1..20] of integer;

begin

k2:=0;

k3:=0;

k4:=0;

k5:=0;

for i:=1 to 20 do

begin

a[i]:=random(4)+2;

if a[i]=2 then k2:=k2+1;

if a[i]=3 then k3:=k3+1;

if a[i]=4 then k4:=k4+1;

if a[i]=5 then k5:=k5+1;

write(a[i],' ')

end;

writeln;

writeln(k2);

writeln(k3);

writeln(k4);

write(k5)

end.

2.

var i,j,v:integer;

a:array [1..10] of integer;

begin

for i:=1 to 10 do

begin

a[i]:=random (100);

write(a[i]:3)

end;

for i:=1 to 9 do

for j:=1 to 9 do

if a[j]>a[j+1] then

begin

v:=a[j];

a[j]:=a[j+1];

a[j+1]:=v

end;

writeln;

for i:=1 to 10 do write(a[i]:3)

end.

3.

var a:array [1..10] of integer;

i,j,m,v:integer;

begin

randomize;

for i:=1 to 10 do

begin

a[i]:=random(100);

write(a[i]:3)

end;

writeln;

for i:=1 to 10 do

begin

m:=i;

for j:=i to 10 do

if a[m] mod 10 < a[j] mod 10 then m:=j;

v := a[i];

a[i]:= a[m];

a[m] := v;

write(a[i]:3)

end;

end.

Const 
n=5;

Var
 ar:array[1..n] of integer;
 ar2:array[1..n] of integer;
 i,k:integer;

 function prost(a:integer):boolean;
 var i:integer;
 b:boolean;
  begin
  b:=true;
   for i:=2 to a div 2 do
    if a mod i=0 then
     begin;
      b:=false;
      break;
     end;
   if a=1 then b:=false;
  prost:=b;
 end;

  begin;
 randomize;
 k:=0;
  for i:=1 to n do
   begin;
    ar[i]:=random(101);
    write(ar[i]:4);
   end;
  writeln;
  for i:=1 to n do
  if prost(ar[i]) then
   begin;
    inc(k);
    ar2[k]:=ar[i];
    write(ar2[k]:4);
   end;
end.