Question

Which of the following digits might composite numbers greater than $10$ have in the ones place?$1,2,3,4,5$

Answer 1

Explaining the concept:

Take the numbers which are less than $10$, that is $\left\{0,1,2,3,4,5,6,7,8,9\right\}$

First Consider the $0$ and even numbers for the digits in ones place, then any number having any of these digits in the ones place will be composite except for $0\mathrm{and}2$.

For the case for odd numbers ,any composite number ones place can be $1,3,5,7,9$

Hence, ones place of any composite number can have any number digit.

Hence, any digit might have composite numbers greater than $10$ have in the ones place.