Question 15 of 22intermediate🔧 ApplyNumerical4 marks

Find different ways of evaluating the following expressions: (a) 1 - 2 + 3 - 4 + 5 - 6 + 7 - 8 + 9 - 10 (b) 1 - 1 + 1 - 1 + 1 - 1 + 1 - 1 + 1 - 1

(a)
Answer

-5. Methods: (1) Left to right evaluation, (2) Grouping pairs: (1-2)+(3-4)+(5-6)+(7-8)+(9-10) = -5

(b)
Answer
  1. Methods: (1) Left to right evaluation, (2) Grouping pairs: (1-1)+(1-1)+(1-1)+(1-1)+(1-1) = 0

Explanation

(a) Both methods give -5 (b) Both methods give 0

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