Pause in a single row of yellow, green and red colored tiles, every red tile is preceded immediately by a yellow tile and every yellow tile is preceded immediately by a green tile. what color is the 24th tile in the row? (1) the 18th tile in the row is not yellow. (2) the 19th tile in the row is not green.

Insufficient data.

Step-by-step explanation:

Given,

Green and red coloured tiles, every red tile is preceded immediately by a yellow tile and every yellow tile is preceded immediately by a green tile,

That is,

The order of tiles is,

Red(R), yellow(Y), green(G)

(1) if 18th tile is not yellow,

Then, possible 18th tile = red or green

Order      18            19           20             21            22          23          24

Tile        R/G          Y/R       G/Y            R/G          Y/R        G/Y         R/G,

(2) If 19th tile in the row is not green.

Then possible 19th tile = yellow or red,

Hence, the data is incomplete to tell what is the colour of 24th tile.