(i) 226981

Let’s consider the number 226981.

Unit digit = 1

The unit digit of the cube root of 226981 = 1

(ii) 13824

Let’s consider the number 13824.

Unit digit = 4

The unit digit of the cube root of 13824 = 4

(iii) 571787

Let’s consider the number 571787.

Unit digit = 7

The unit digit of the cube root of 571787 = 3

(iv) 175616

Let’s consider the number 175616.

Unit digit = 6

The unit digit of the cube root of 175616 = 6