Question

When any natural number is divided by 10 what is the sum of all possible reminders?

Answer 1

When a natural number is devided by 10, we get all natural numbers from 1 to 9 as reminders
eg:11/10= reminder =1
12/10:reminder is 2
.....
....
...
19/10:reminder is 9

so the sum of possible reminders is 1+2+3+4+5+6+7+8+9
=45

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