Question

if a1=5 and an=nan-1-4 then find the value if a3

Answer 1

EXPLANATION

If a_1 = 5 and a_n = n*a_n-1 - 4 the value of a_3 is given by the following relationship:

$a_2=\text{ 2}\cdot5\text{ - 4 = 10-4=6}$$a_3=2\cdot6-4=12-4=8$

The answer is 8