In de onderste rij komt van links naar rechts: 25 15 10 15 9 6 10 6 4 .
0,06
0,25
0,38
12 , 15
0,3 ⋅ 0,2
0,5 ⋅ 0,2 = 0,1
3 4 ⋅ 3 4 ⋅ 3 4 = 27 64
Sharon moet drie keer succes hebben, de kans daarop is 0,4 ⋅ 0,4 ⋅ 0,4 = 0,064 .
Mark moet drie keer geen succes hebben, de kans daarop is 0,6 ⋅ 0,6 ⋅ 0,6 = 0,216 .
4 9 , 5 9
3 10 ⋅ 2 9 = 1 15
Dan pakt ze gg, gb, bg of bb, de kans daarop is: 3 10 ⋅ 2 9 + 3 10 ⋅ 2 9 + 2 10 ⋅ 3 9 + 2 10 ⋅ 1 9 = 18 90 = 2 9 .
5 10 ⋅ 4 9 + 3 10 ⋅ 2 9 + 2 10 ⋅ 1 9 = 28 90 = 14 45
3 5 ⋅ 3 5 ⋅ 2 5 = 18 125
2 5 ⋅ 2 5 ⋅ 3 5 + 3 5 ⋅ 2 5 ⋅ 2 5 + 2 5 ⋅ 3 5 ⋅ 2 5 = 36 125
3 5 ⋅ 2 4 ⋅ 2 3 = 12 60 = 1 5
2 5 ⋅ 1 4 ⋅ 1 + 2 5 ⋅ 3 4 ⋅ 1 3 + 3 5 ⋅ 2 4 ⋅ 1 3 = 3 10
Zie de figuur links
7 42 ⋅ 35 42 ⋅ 35 42 ⋅ 3 = 75 216 ≈ 0,35
Zie de figuur rechts.
2 3 ⋅ 3 5 = 2 5
1 − 2 5 = 3 5
( 1 3 ) 3 = 1 27
1 3 ⋅ 2 3 ⋅ 2 3 + 2 3 ⋅ 1 3 ⋅ 2 3 + 2 3 ⋅ 2 3 ⋅ 1 3 = 12 27 = 4 9
Zonder terugleggen.
5 7 ⋅ 4 6 ⋅ 3 5 = 2 7
1 − 2 7 = 5 7