In such type of questions, a few essential criteria for selection of a group of items are given. The candidate has to keep these conditions in mind and make the required selection as per the directions given in each question.
At an Electronic Data Processing Unit, five out of the eight program sets P, Q, R, S, T, U, V and W are to be operated daily. On any one day, except for the first day of a month, only three of the program sets must be the ones that were operated on the previous day. The program operating must also satisfy the following conditions :
(i). If program P is to be operated on a day, V cannot be operated on that day.
(ii). If Q is to be operated on a day, T must be one of the programs to be operated after Q.
(iii). If R is to be operated on a day, V must be one of the programs to be operated after R.
(iv). The last program to be operated on any day must be either S or U.
If the program sets R and W are to be operated on the first day, which of the following could be the other programs on that day ?
Since R is operated, so V must also be operated.
Also, S or U is to be taken at the end.
So, the possible combinations are Q, S, V and T, S, V.
Now, Q must have T as one of the programs after it, which is not possible. So, Q, S, V is incorrect.