Answer:
Using n = 1, 2, 3, 4, 5, the first five terms can be calculated.
If n = 1,
a1 = 2
If n = 2,
a2 = 2
If n = 3,
a3 = a3–1 – 1
= a2 – 1
= 2 – 1
= 1
If n = 4,
a4 = a4–1 – 1
= a3 – 1
= 1 – 1
= 0
If n = 5,
a5 = a5–1 – 1
= a4 – 1
= 0 – 1
= -1
∴ First five terms of the sequence are 2, 2, 1, 0, -1.