Question

Find the missing number in the following number matrix.

• A. 9
• B. 4
• C. 5
• D. 10

Hint:

Look for row/column symmetries when dealing with 2x2 inner matrices.
Here, the sum of the bottom row ($5+3=8$) is exactly half of the outer bottom number ($16$).
By symmetry, the sum of the top row ($2+?$) should also be half of the outer top number ($12$), which is $6$.
Thus:
\[ 2 + ? = 6 \quad \implies \quad ? = 4 \] This quick shortcut yields the correct answer in seconds.

Answer 1

The Correct Option is B