Q18
What BEST can be concluded about the value of x?
Answer: B
Table: Data Analysis (DA) 12, Database Handling (DH) 5, Coding (C) 7, DA&DH 2, DH&C 3, DA&C 6, all three x. Each count includes those with more expertise (so DA&DH = 2 includes the x who have all three).
Region counts (each must be ≥ 0):
- DA&DH only = 2 − x, DH&C only = 3 − x, DA&C only = 6 − x, so x ≤ 2.
- Only DH = 5 − (2 − x) − (3 − x) − x = x
- Only C = 7 − (3 − x) − (6 − x) − x = x − 2, so x ≥ 2.
- Only DA = 12 − (2 − x) − (6 − x) − x = 4 + x
Both conditions together force x = 2.
Answer: 2 only (Option 2)