Question

11+22+33+...+1010 is divided by 5. what is the remainder? (a) 0 (b) 1 (c) 2 (d) 3 (e) 4

Answer 1

adding the last digits 1+2+3+4+5+6+7+8+9+0 = 45

so the sum will end in 5 so its divisible by 5 and the remainder will be 0

It (a)