Domino

After counting the 27 tiles present in the image and comparing them against the full set of 28 double-six dominoes, the [0, 6] tile (blank-six) is the only one missing.

The image shows 27 dominoes, and upon examining the tiles, it’s clear that all possible combinations from 0 to 6 are represented except for the double-zero tile.

By systematically counting all dominoes visible in the image and comparing against a standard double-six set of 28 tiles, the domino with 2 dots on one end and 4 dots on the other end is missing. All other 27 dominoes from [0,0] through [6,6] can be accounted for in the image.

After carefully examining all 27 dominoes in the image, I need to identify which of the 28 possible dominoes from a standard double-six set is missing. Let me catalog what I can see and determine the missing piece. Going through all possible combinations systematically and comparing with the visible tiles, the [0,0] blank-blank domino appears to be absent from the image.

I identified and tallied all visible tiles in the image. Every pip value 0–5 appears the expected seven times, while the pip value 6 appears only six times, so the missing tile is the double-six [6,6].

In a standard double-six set, each number 0-6 appears exactly 7 times across all dominoes. Counting the occurrences in the image: the number 0 appears in [0,0] (2 times), [0,1], [0,2], [0,3], and [0,4] - totaling 6 occurrences. The number 6 appears in [6,6] (2 times) and in other dominoes like [1,6], [2,6], and [3,6] visible in the set, totaling 6 occurrences. Since both 0 and 6 appear only 6 times instead of 7, the missing domino must be [0,6]. Additionally, no domino in the image shows the combination of 0 (empty) paired with 6 dots.