Arithmetic Sequences (AQA A-Level Mathematics): Quizzes

Sequence with constant difference

$1, 2, 4, 8, 16, \ldots$

$4$

The common difference

$a_n = a + (n - 1)d$

$19$

$a, a+d, a+2d, a+3d, \ldots$

$S_n = \frac{n}{2}(2a + (n-1)d)$

$55$

$47$