What should replace the question mark?
| 16 | 25 | 9 |
| 36 | 64 | 81 |
| 10 | 13 | ? |
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → 12
The first two rows are perfect squares, and in each column the third number is the sum of the square roots of the two numbers above it.
Column 1: \(\sqrt{16}+\sqrt{36}=4+6=10\)
Column 2: \(\sqrt{25}+\sqrt{64}=5+8=13\)
Column 3: \(\sqrt{9}+\sqrt{81}=3+9=12\)