Bonjour,
1.
P(S1) = 1/8 (n = 1)
P(S2) = 2/8 = 1/4 (n = 2 ou n = 3)
P(S3) = 4/8 = 1/2 (n = 4 ou n = 5 ou n = 6 ou n = 7)
P(S4) = 1/8 (n = 8)
2. P(A) = P(S2) + P(S4) = 2/8 + 1/8 = 3/8
3. P(B) = P(S1) + P(S2) + P(S3) = 7/8
4.
S1 = 360° / 8 = 45°
S2 = 90°
S3 = 180°
S4 = 45°
