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Question
Observe the following:
1 + 2 – 3 + 4 + 5 – 6 – 7 + 8 – 9 = –5
Change one ‘–’ sign as ‘+’ sign to get the sum 9.
Solution
On observing the given expression, 1 + 2 – 3 + 4 + 5 – 6 – 7 + 8 – 9 = –5, we noticed that (–7) should be replaced by (+7) to get a result of 9.
Thus, 1 + 2 – 3 + 4 + 5 – 6 + 7 + 8 – 9
= (1 + 2 + 4 + 5 + 7 + 8) – (3 + 6 + 9)
= 27 – 18
= 9
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