Domino

By systematically checking all 28 tiles in a standard double-six set (0-0 through 6-6) against the 27 tiles present in the image, the domino with values 4 and 6 is missing.

By systematically cataloging all visible dominoes in the image, I identified 27 tiles. Checking against the standard 28-piece double-six set (which contains all combinations of numbers 0-6), the domino with 4 dots on one end and 5 dots on the other is missing.

The image contains 27 dominoes, one less than the 28 unique tiles in a standard double-six domino set. By examining the image, we can identify the existing dominoes and compare them to the complete set. Upon inspection, it is evident that the domino [3, 3] is missing.

I systematically catalogued all visible dominoes in the image. A standard double-six set has 28 tiles. After identifying all 27 visible tiles, the missing one is [0,3] (blank-three), which does not appear anywhere in the image.

After listing the visible dominoes and comparing to the complete double-six set, the only missing tile is the one showing 3 and 5.

After cataloging all 27 visible dominoes, every tile from the standard double-six set is present except [5,6]. All doubles [0,0] through [6,6] are present except the combination of 5 and 6 is missing from the non-double pairs. The domino [5,6] would show 5 pips (four corners plus center) on one side and 6 pips (arranged as two columns of three) on the other, and no such tile appears in the image.