Manipal Entrance Test 2014 Math Paper

Total number of cases =‌50C1=50
Let A be the event of selecting ticket with sum of digits '8'
Favourable cases to A are {08,17,26, 35, 44}.
Let B be the event of selecting ticket with product of its digits '7'
Favourable cases to B is only {17}.
Now, P(

B

A

)=

P(A∩B)

P(A)

=

1∕50

5∕50

=

1

5