Concept: P(A: Not hitting the target )=1−P(A: hitting the target ) Calculations: Person A can hit a target 4 times in 5 attempts. Person B−3 times in four attempts. Person C−2 times in 3 attempts. P(A: hitting the target )=
4
5
⇒P(A: Not hitting the target )=
1
5
P(B: hitting the target )=
3
4
⇒P(B: Not hitting the target )=
1
5
P(C: hitting the target )=
2
3
⇒P(C: Not hitting the target )=
1
3
The probability that the target is hit atleast two times =P(A)P(B)P(C)+P(A)P(B)P(C)+P(A)P(B)P(C)+P(A)P(B)P(C) ⇒ The probability that the target is hit atleast two times =
1
5
+
1
10
+
2
15
+
2
5
⇒ The probability that the target is hit atleast two =