Question

1+12+23+34+...+89+100=?

Answer 1

= 1+11+23+34+45+56+67+78+89+100= 504

Answer 2

1+11+23+34+45++56+67+78+89+100=505

 

Answer 3

1+12+23+34+...+89+100

=1+11+23+34+45+56+67+78+89+100=505