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: .an

.n ≥ 2 an = an−1 + 4 a1 = 3

{an }

: {15 − (−2)n }

15 − (−2)1 = 17
15 − (−2)2 = 11
15 − (−2)3 = 23
15 − (−2)4 = −1
15 − (−2)5 = 47

[Arithmetic Sequences] (.)

.

an +1 − an = d {an }

d n

{2n + 2} .(common difference)

2

.an+1 − an = 2(n + 1) + 2 − (2n + 2) = 2

4, 6, 8, 10, …

.d a1

a2 = a1 + d
a3 = a2 + d = a1 + 2d