The one’s digit of the cube of 23 is

Question:

The one’s digit of the cube of 23 is

(a) 6

(b) 7

(c) 3

(d) 9

Solution:

(b) We know that, the cubes of the numbers ending with digits 3 and 7, have 7 and 3 at one’s digit, respectively.

So, the one’s digit of the cube of 23 is 7.

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