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Mathematics
Problem
The first term of an arithmetic progression is 5 and its common difference is −2. Which of the following gives the n-th term
a
n
a_n
a
n
of this progression? a)
a
n
=
5
+
2
(
n
−
1
)
a_n = 5 + 2(n - 1)
a
n
=
5
+
2
(
n
−
1
)
b)
a
n
=
5
−
2
n
a_n = 5 - 2n
a
n
=
5
−
2
n
c)
a
n
=
5
−
2
(
n
−
1
)
a_n = 5 - 2(n - 1)
a
n
=
5
−
2
(
n
−
1
)
d)
a
n
=
−
2
+
5
(
n
−
1
)
a_n = -2 + 5(n - 1)
a
n
=
−
2
+
5
(
n
−
1
)
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