1.7.4 Arithmetic sequences and series (A-level only)

An arithmetic progression has first term $a\,$ and common difference $b$ .

Prove that the sum of the first $N\,$ terms of the progression is

S_N = \frac{1}{2}N\{2a + (N-1)b\}

[4]

An arithmetic progression has first term $a\,$ and common difference $b$ .

Prove that the sum of the first $N\,$ terms of the progression is

S_N = \frac{1}{2}N\{2a + (N-1)b\}

[4]

1.7.4 Arithmetic sequences and series (A-level only) Questions