bonjour,
1)
p1 = p2/2
=> p2 = 2p1
p1 = p3/3
=> p3= 3p1
p1 = p4/4
=> p4= 4p1
p1 = p5/5
=> p5= 5p1
p1 = p6/6
=> p6= 6p1
2)
p1 +p2 +p3 +p4+p5 +p6=1
p1 +2p1+3p1+4p1+5p1+6p1 =1
21p1 =1
p1 = 1/21
3)
a)
nombre pair
{2;4;6 }
2/21+4/21+6/21 = 12/21=4/7
b)
multiple de 3
{3;6}
3/21 + 6/21 = 9/21=3/7
