Fewpal
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Write the digits 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9 in this order and insert ‘+ ‘or ‘–’ between them to get the result 

(a) 5 

(b) –3

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(a) 0 + 1 – 2 + 3 – 4 + 5 – 6 + 7 –8 + 9 = 5 

(b) 0 – 1 – 2 + 3 + 4 – 5 + 6 – 7 + 8 – 9 = –3

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