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If m and n are positive integers then the digit in...

This question belongs to Arithmetic Ability Number System
Number System
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If m and n are positive integers, then the digit in the unit's place of 5n + 6m is always :

Answer & Solution
Correct Answer: Option A
In 5n we have 5 as unit digit and in 6m we have 6 as unit digit.
∴ 5 + 6 = 11(i.e unit digit always be 1)
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