Find the sum of:

Other · Multi-part · ISC · Mathematics · Algebra · Arithmetic progressions

Problem

Find the sum of: (1)

7 + 9 + 11 + 13 + \dots

to 10 terms (2)

3 + 7 + 11 + 15 + \dots

to 20 terms (3)

\frac{1}{2} + 3 + 5\frac{1}{2} + 8 + \dots

to 50 terms (4)

100 + 93 + 86 + 79 + \dots

to 40 terms (5)

(-31) + (-28) + (-25) + (-22) + \dots

to 15 terms (6)

50 + 48\frac{1}{2} + 47 + 45\frac{1}{2} + \dots

to 80 terms.

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