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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 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 operated on a day is P, Q, W, T, U each of the following could be the next day’s program set except
The current list is : P, Q, W, T, U
Now, we shall have three elements from this list and two from the remaining ones: R,S,V.
We shall test each of the options:
1. QRVTU: This is a valid combination as it satisfies all the conditions.
2. QTVWS: This is a valid combination as it satisfies all the conditions.
3. WRVTU: This is a valid combination as it satisfies all the conditions.
4. WTSPU: We can only take three elements out of P, Q, W, T, U. However, this option takes four, hence an invalid option.
