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Byju's Answer
Standard X
Mathematics
Sum of N Terms of an AP
Sum -712, -...
Question
Sum
−
7
1
2
,
−
7
,
−
6
1
2
, ..... to
24
terms.
Open in App
Solution
The given series is
−
7
1
2
,
−
7.5
,
−
6
1
2
,
.
.
.
to
24
terms
∴
a
=
−
7
1
2
=
−
7.5
and
d
=
−
7
−
(
−
7.5
)
=
0.5
∴
S
n
=
2
a
+
(
n
−
1
)
d
⟹
S
24
=
(
2
×
−
7.5
)
+
[
(
24
−
1
)
×
(
0.5
)
]
=
−
15
+
11.5
S
24
=
−
3.5
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0
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