Directions: Answer the questions based on the information given below.
Consider the four following missing number series I, II, III and IV.
Series I: 640, 4480, ____ , 5040, 504, 5544
Series II: 119, 60, ____ , 124, 500, 4008
Series III: 2, 10, 48, 190, ____ , 1134
Series IV: 697, 553, 453, 389, 353, ____
If missing term of series (I), (II), (III) and (IV) are represented by 'a', 'b', 'c' and 'd' respectively then what is the probability of randomly selecting a 'pair' of two numbers from the set {a, b, c, d} such that both numbers in the selected 'pair' are prime?
1
0
2
1/2
3
1/4
4
1/6
5
1/8