Answers

2016-03-19T22:31:23+05:30
2016-03-19T22:35:39+05:30
Every fourth year is a leap year so they both cannot born in leap yaer due to age difference of 3 years
the one will born in leap year and other in non leap year so 
prbablity (both )=0
probablity(one)=1/2
0