Exercise :: Number puzzles
| Answer | : | 6 |
| Explanation | : | Looking at the diagram in rows, the central circle equals half the sum of the numbers in the other circles to the left and right of the centre. |
| Answer | : | 9 |
| Explanation | : | The number at the centre of each triangle equals the sum of the lower two numbers minus the top number. |
| Answer | : | 19 |
| Explanation | : | As you move diagonally down, numbers follow the sequence of Prime Numbers. |
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