2. Sequence
a sequence is an ordered
collection of objects in which
repetitions are allowed. Like a set,
it contains members (also
calledelements,orterms).
3. In Math, a sequence Is a
function whose domain is
the finite set {1, 2, 3,âŠ, n}
or the infinite set {1, 2, 3,âŠ}
11. {50, 44, 38, 32,âŠ}
Where a1 = 50, a4 = 32, and d = -6
12. The first term of an arithmetic
sequence is equal to 200 and the
common difference is equal to -10.
Find the value of the 20th term.
a20 = 200 + (20 - 1) (-10)
a20 = 200 - 190
a20 = 10
an = a1 + (n - 1) d
13. If a1 = 4, a4 = 13, what are
the values of a2 and a3?
an - ak
n - kd =
13 - 4
4 - 1d =
d = 3
4 , 7 , 10 , 13
14. Letâs Try!
1.) 3, 1, -1, ⊠the 21st term
2.) 14, 6, -2, âŠthe 29th term
3.) 18th term of the arithmetic
sequence if a1 = 25 and d=2
15. Answers:
1.) 3, 1, -1, ⊠the 21st term
an = a1 + (n - 1) d
a21 = 3 + (21-1)(-2)
a21 = 3 + (-40)
a21 = -37