X-2,4x,7x+2 Find the 12th term
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Answered by
4
Answer:
Soooory Dear I can't understand your question......
❤️ ❤️ Sweety ❤️ ❤️
Answered by
2
An arithmetic sequence has a common difference.
∴
d
=
4
x
−
(
x
−
2
)
=
3
x
+
2
The sum of the first n terms of an arithmetic series can be given by
S
n
=
n
2
(
2
a
+
(
n
−
1
)
d
)
where
a
is the first term.
∴
S
12
=
12
2
(
2
(
x
−
2
)
+
11
(
3
x
+
2
)
)
=
6
(
2
x
−
4
+
33
x
+
22
)
=
6
(
35
x
+
18
)
=
210
x
+
108
-Jai
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