Question

if $a_1 = 6$ and $a_n = a_{n - 1} - 2$ then find the value of $a_4$.

Explanation:

Step1: Find $a_2$ using $a_1$

$a_2 = a_1 - 2 = 6 - 2 = 4$

Step2: Find $a_3$ using $a_2$

$a_3 = a_2 - 2 = 4 - 2 = 2$

Step3: Find $a_4$ using $a_3$

$a_4 = a_3 - 2 = 2 - 2 = 0$

Answer:

$0$