Question

Write the digits 0, 1, 2, 3, ..., 9 in this order and insert ‘+’ or ‘–’ between them to get the result 3.

Answer 1

Given digits are 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9.

To get sum 3,

0 + 1 + 2 + 3 – 4 + 5 + 6 + 7 – 8 – 9

= 1 + 2 + 3 + 5 + 6 + 7 – (4 + 8 + 9)

= 24 – 21

= 3