Oracle Company Numerical Ability Alligation or Mixture

In a class, there are 10 boy children and 13 girl children. What is the probability of selecting two children, as a first girl and then a boy in succession without replacement?
a) 1/130 b) 13/10 c) 120/130 d) 130/506

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Oracle Other Question
Which of the following operations cannot be implemented in O(1) for a unsorted singly linked list with head and tail pointers?
a) deletion of the last node
b) Insertion at the end
c) Deletion of the front node
d) Insertion at front A 20% salt solution of 100 liters is mixed with a quantity of 10% solution. the resulting solution was 12% salt. How much was 10% solution added?
a) 175 lit b) 200 lit c) 400 lit d) 500 lit