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Directions for Questions 1-5 In each question below there are four groups. Each group consists of either one number and two letters or two numbers and one letter. Four of these five groups follow one principle, one does not. The correct answer is the group which does not follow the same principle. Find correct answer.

A)  1,E,3       

B)  3,J,6

C)  6,Q,10      

D)  10,Z,15

E)  15,W,21

Correct Answer: E

Solution :

 In all others, value of the letter is one more than the sum of the two numbers e.g. E = (1+ 3) + 1 = 5 which is the face value of E.