Arithmetic Series

An arithmetic sequence has first term 18 and last term 128. If there are 23 terms in the sequence, find the sum of all the terms.

Which formula would you use?

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An arithmetic sequence has u1 = 5 and u10 = 176.

Find S12.

Which formula would you use?

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An arithmetic sequence has first term 50 and twentieth term -26.

Find the sum of the first 80 terms.

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An arithmetic sequence has first term 7 and common difference 3.

Find the sum of the first 18 terms.

Which formula would you use?

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An arithmetic expression has u1 = 16 and u17 = 176.

Find S17.

Which formula would you use?

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An arithmetic sequence has u1 = 3 and u42 = 454.

Find S42.

Which formula would you use?

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An arithmetic sequence has first term -20 and last term 79.

If there are 12 terms in the sequence, find the sum of all of the terms.

Which formula would you use?

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An arithmetic sequence has u1 = 8 and d = -8.

Find S24.

Which formula would you use?

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An arithmetic sequence has u1 = 60 and d = 6.

Find S12.

Which formula would you use?

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An arithmetic sequence has u1 = 14 and u22 = 4 704.

Find the sum of the first 100 terms.

What formula would you use?

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