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Question

The unit's digit in the cube of 2, 16, 20 is always _____.


A

4096

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B

6859

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C

1331

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D

9261

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Solution

The correct option is A

4096


23 = 2× 2 × 2 = 8
163 = 16× 16 × 16 = 4096
203 = 20× 20 × 20 = 8000

As 2, 16, 20 are even numbers and the cube of an even number is always even , the unit's digit of the cubes of the given numbers are even.


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