considering an Arithmetic sequence 100,95,90,.. Find the sum of term from 20th to 40th
Answers
Answered by
0
Answer:
We determine the number of terms using the formula
t
n
=
a
+
(
n
−
1
)
d
:
5
=
100
+
(
n
−
1
)
−
5
5
=
100
−
5
n
+
5
5
n
=
100
+
5
−
5
5
n
=
100
n
=
20
Step 2: Find the sum
We are now able to find the sum using the formula
s
n
=
n
2
(
a
+
t
n
)
s
20
=
20
2
(
100
+
5
)
s
20
=
10
(
105
)
s
20
=
1050
Hence, the sum of the arithmetic sequence is
1050
.
Hopefully this helps!
Answered by
11
Answer:
answer for the given problem is -45
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