Which is unit digit of $6^{18} - 5^{10}$ ?

5

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8

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1

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9

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Solution

The correct option is C $1$
$6^{18} - 5^{10}$ will end with $6 - 5 = 1$ as
$6^{n}$ and $5^{n}$ end with $6$ and $5$ respectively.
Hence, option $(3)$ is correct.

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