On a windy day, out of every 3 sand dunes formed, only 1 remains. Out of 5 blown-out
sand-dunes, 1 has treasure and only 2 out of 7 sand dunes formed have lucky coupons. Find
the probability that the blown-out sand dune will contain both the things. Options:
A) 2/25
B) 4/75
C) 7/75
D) 3/79
E) 4/5
Probability of sand dune blown out = 2/3   Probability that it has treasure = 1/5   Probability that it has lucky coupon = 2/7   total probability = 2/3 * 1/5 * 2/7 = 3/79   ANSWER:3/79
<result>D</result>
On a windy day, out of every 3 sand dunes formed, only 1 remains. Out of 5 blown-out
sand-dunes, 1 has treasure and only 2 out of 7 sand dunes formed have lucky coupons. Find
the probability that the blown-out sand dune will contain both the things.