Write the digits 0, 1, 2, 3, ..., 9 in this order and insert ‘ + ’ or ‘–’ between them to get the result 3.
The given digits are 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9.
Now to get result 3,
⇒ 0 + 1 + 2 + 3 – 4 + 5 + 6 + 7 – 8 – 9
⇒ 24 – 21
⇒ 3