IBPS PO Prelims Model Paper 15

In a box, no. of black marbles = 4
No.of orange balls = 4
No.of blue balls = 2
Two marbles are drawn at random probability that atleast one of them is green.
Case 1: Both are blue

2C2

10C2

=

1

45

Case 2: One is blue and one is of different colour =

2C1×8C1

10C2= 16 45

Required probability =

1

45

+

16

45

=

17

45