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Units Digits in Cube Numbers

The digit in ...

Question

The digit in the units place in the cube of 298 is

A

3n-1

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B

3n+1

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C

3n-2

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D

3n

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Solution

The correct option is A
3n-1

The digit in the units place in 298 is 8.
cube of 8 is 512, which ends in 2.
Hence, the digit in the units place in the cube of 298 is 2

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