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