If m and n are positive integers, then the digit in the unit's place of 5n + 6m is always :
A. 1
B. 5
C. 6
D. n + m
Answer: Option A
Solution (By Examveda Team)
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)
This Question Belongs to Arithmetic Ability >> Number System
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