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Byju's Answer
Standard X
Mathematics
Sum of N Terms of an AP
Find S15 of...
Question
Find
S
15
of the following A.P.:
4
,
8
,
12
,
.
.
.
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Solution
a
=
4
,
d
=
t
2
−
t
1
=
8
−
4
=
4
, where
t
2
,
t
1
are the
1
st and
2
nd term of the A.P.
S
15
=
n
2
[
2
a
+
(
n
−
1
)
d
]
=
15
2
[
2
×
4
+
(
15
−
1
)
×
4
]
=
15
2
×
[
8
+
56
]
=
15
2
×
64
=
480
.
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