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Byju's Answer
Standard XII
Mathematics
Summation by Sigma Method
Find the 15...
Question
Find the
15
t
h
term of the series
3
,
9
,
15
,
21
,
27
,
33
,
.
.
.
.
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Solution
The given series is
3
,
9
,
15
,
21
,
27
,
33
,
.
.
.
.
The given series is in
A
P
with
a
=
3
,
d
=
9
−
3
=
6
The
15
t
h
term is given as
a
15
=
a
+
14
d
3
+
14
(
6
)
3
+
84
=
87
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