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Express each of the following sums in sigma notation (a) 4 +8 + 12 + 16 + 20 = I'M 55 (b) 4 - 8+

Express each of the following sums in sigma notation (a) 4 +8 + 12 + 16 + 20 = I'M 55 (b) 4 - 8+ 12 - 16 + 20 55 (c) -4+8 -12 + 16 - 20 = 60 E Hint: (-1) = i is odd 1 , i is even

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