Answer:
a₆ = 4 + 3 * (6-1) = 19
aₙ = a₁ + 3 * (n-1)
Step-by-step explanation:
a₁ = 4 = 4 + 3*0 = a₁ + 3 * (1-1)
a₂ = 7 = 4 + 3*1 = a₁ + 3 * (2-1)
a₃ = 10 = 4 + 3*2 = a₁ + 3 * (3-1)
.......
aₙ = a₁ + 3 x (n-1)
