Probability of hitting the balloon by A i.e. P(A)=
4
6
=
2
3
Probability of hitting the balloon by B i.e. P(B)=
3
5
Probability of hitting the balloon by C i.e. P(C)=
2
3
Probability of hitting the balloon by at least two of A,B and C =P(A∩B∩C′)+P(A∩B′∩C) +P(A′∩B∩C)+P(A∩B∩C) =P(A)×P(B)×P(C′)+P(A)×P(B′)×P(C)+P(A′) ×P(B)×P(C)+P(A)×P(B)×P(C) =