Discussion
A rectangular array of 4 columns at 25 units and 3 rows at 40 units spans overall
Answer: D
Correct answer: 75 by 80 units between outermost centres
The span between outermost centres counts the gaps rather than the items: four columns have three gaps and three rows have two. \[ 3 \times 25 = 75, \qquad 2 \times 40 = 80. \] Multiplying by the counts instead gives 100 by 120, which is the trap.
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