Question

answer the question in brief no 12

Answer 1

total balls=12
red ball be x
p(e1)=x/12

6 more red balls put in balls
total red balls=x+6
total balls=18
p(e2)=x+6/18
now p(e1)=2*p(e2)
x+6/18=2*x/12
x+6=3x
6=3x-x
6/2=x
3=x
number of red balls are 3

hope it help u