Kenya KCSE · Mathematics

Sequences and series

9 practice questions, each with the answer and an explanation.

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All 9 questions

  1. The first term of an arithmetic progression is 9 and the common difference is 5. Find the sum of the first 15 terms.
  2. The first term of an arithmetic progression is 3 and the common difference is 6. Find the sum of the first 20 terms.
  3. The first term of an arithmetic progression is 2 and the common difference is 4. Find the sum of the first 17 terms.
  4. The first term of an arithmetic progression is 3 and the common difference is 5. Find the sum of the first 8 terms.
  5. The first term of an arithmetic progression is 5 and the common difference is 7. Find the sum of the first 9 terms.
  6. Find the sum of the first 5 terms of the geometric progression 2, 6, 18, ...
  7. Find the sum of the first 6 terms of the geometric progression 3, 6, 12, ...
  8. Find the sum of the first 5 terms of the geometric progression 5, 10, 20, ...
  9. Find the sum of the first 5 terms of the geometric progression 1, 4, 16, ...

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