Subject: mathqa
Question: the probability that a man will be alive for 10 more yrs is 1 / 2 & the probability that his wife will alive for 10 more yrs is 1 / 3 . the probability that none of them will be alive for 10 more yrs , is
Option: 
A: 1
B: 3 / 4
C: 2
D: 1 / 3
Answer: D