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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