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Arithmetic Sequences
hard
0:00.0
In an AP,
a
1
=
10
,
d
=
−
2
a_1 = 10, d = -2
a
1
=
10
,
d
=
−
2
. Find
S
10
S_{10}
S
10
.
A
10
B
20
C
30
D
40
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