An Interesting Pattern

Algebra Level pending

Consider the following pattern:

Row 1          1 + 2 = 3
Row 2          4 + 5 + 6 = 7 + 8
Row 3          9 + 10 + 11 + 12 = 13 + 14 + 15

Find the sum of either side of the equation for row 100

South African Mathematics Olympiad Problem 10 Junior Round 3 Paper 2010

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