In the sequence of tiles shown below, the missing tile indicated by the…

Count the dots in each tile of the sequence: the first tile has 2 dots, the second has 3, the fourth has 7, and the fifth has 11. These are consecutive prime numbers (2, 3, 5, 7, 11), so the missing third tile must contain 5 dots. The option showing five dots — four at the corners plus one in the center (a quincunx) — completes the prime-number progression.