if a1 = 6 and an = an-1 - 5 then find the value of a5

Answer 1

a₁ = 6 and a_n = a_n-1 - 5

a₂ = a_2-1 - 5 = a₁ - 5 = 1

a₃ = a_3-1 - 5 = a₂ - 5 = -4, etc