JEE Mains Model Paper 13

p = probability of getting a head in a single toss of a coin =

1

2

q = probability of getting 5 or 6 in a single throw of die =

2

6

=

1

3

Req. probability = p + (1 - p) (1 - q) p + (1−p)2 (1−q)2 p + ……..

p

1−(1−p)(1−q)

=

1∕2

1−( 1 2 )( 2 3 )

=

3

4