If m and n are positive integer, then the digit in the units place of $5^{n} + 6^{m}$ is always.

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n + m

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Solution

The correct option is A 1
If m and n are positive integer then for
$5^{n}$ then the digit at unit place is always $5$
$6^{m}$ then the digit at unit place is always $6$
so in $5^{n} + 6^{m}$ the sum of unit place digit is always $11$ so the unit place digit is always $1$

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