Arithmetic Series (Leaving Cert Mathematics): Quizzes

Series adds terms, sequence lists them

Sum of first $n$ terms

The first term

Common difference between terms

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

$670$

$T_n = S_n - S_{n-1}$

$3$

$12$

$n$ must be positive

$3$