Find the sum of:

MATHEMATICS · Multi-part · A Level · Mathematics · Sequences and series · Sequences and series

Problem

Find the sum of: (1) 7+11+15+19+⋯+997 + 11 + 15 + 19 + \dots + 99 (2) 35+3312+32+3012+⋯+2035 + 33\frac{1}{2} + 32 + 30\frac{1}{2} + \dots + 20

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