Question: Write the following series using the sigma notation. a) 2 + 5 + 8 + 11 + ... b) 1 + 4 + 9 +

Write the following series using the sigma notation.

a) 2 + 5 + 8 + 11 + ...

b) 1 + 4 + 9 + 16 + ... + 121

c) 7 + 3 − 1 − 5 + ...

d) x² − x4 + x6 − x8 + x10 − x12 

e) 1 + 2+ 3 + 4 + 5 + 6 + 7 + 8

f)
12+ 15 + 18+ 21 + ...

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