Danish randomly picks 3 distinct integers from the set {1, 2, 3, 4, 5, 6, 7} and arranges them in descending order to form a 3-digit number. Kavitha randomly picks 3 distinct integers from the set {1, 2, 3, 4, 5, 6} and also arranges them in descending order to form a 3-digit number. What is the probability that the number formed by Danish is greater than that of Kavitha?please explain for me....

1) 3/7
2) 4/7
3) 3/5
4) 7/10
5) 2/5