IB skill practice

Calculate arithmetic and geometric series

Choose and apply finite arithmetic and geometric series formulae, showing clear reasoning about the structure of the sequence.

Paper 1 6 marks Difficulty 2

Arithmetic series practice

For the arithmetic sequence \(-13, -9, -5, \ldots\), find \(d\) and calculate \(S_{20}\).

Worked practice: sequences and series

Find the common change or ratio, then use it to calculate the requested term or sum.