Question

http://prntscr.com/38csmu

Answer 1

What is your choice, and why?

Answer 2

No. of require outcome = multiples of 10 = 3 {10,20,30}
Total of possible outcomes = 6
\[P(event|10n) = \frac{ 3 }{ 6}\]Reduce that to get \[P(event|10n) = \frac{ 1}{ 2}\]