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Standard X
Mathematics
Patterns, Sequences
Question 8 Fi...
Question
Question 8
Find the sum of first 51 terms of an AP whose second and third terms are 14 and 18 respectively.
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Solution
G
i
v
e
n
t
h
a
t
,
a
2
=
14
a
3
=
18
d
=
a
3
−
a
2
=
18
−
14
=
4
a
2
=
a
+
d
14
=
a
+
4
a
=
10
S
n
=
n
2
[
2
a
+
(
n
−
1
)
d
]
S
51
=
51
2
[
2
×
10
+
(
51
−
1
)
×
4
]
=
51
2
[
20
+
200
]
=
51
×
220
2
=
51
×
110
=
5610
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