From the questions (15-20)
Seven boxes - P, Q, R, S, T, U and V- are kept one above the other, but not necessarily in the same order. Each box has a different number viz. 2, 5, 6, 7, 10, 11 and 15, but not necessarily in the same order.
Only two boxes are kept between R and S. Only four boxes are kept between R and box number 10. Box number 2 is kept immediately below V. V is kept at one of the positions below S. R's number is not 2. Only three boxes are kept between and box number 11. Q is neither the topmost nor the lower-most box. The difference between and box immediately below it is more than nine. O's box number is not 5. Only two boxes are kept between box number 5 and U. The sum of box numbers of U and T is 8.
Four of the following five are alike in a certain way and hence form a group. Which of the following does not belong to the group?