IBPS SO Prelims Exam Model Paper 7

Given:
Total number of tokens = 20
Number of tokens divisible by 2 = Even numbered tokens =

20

2

= 10
Calculation:
Number of ways first token can be selected out of 10 even numbered tokens = 10C1 = 10
Number of ways second token can be selected out of 10 even numbered tokens = 9C1 = 9
Probability of drawing first token =

10

20

=

1

2

Probability of drawing second token =

9

19

Required probability = (

1

2

) × (

9

19

) =

9

38