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CBSE Board Practice
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Class VI
Class VII
Class VIII
Class IX
Class X
CBSE Grade X - Arthimetic Progressions
Question
1
1.
The common difference of the A.P.
4
,
12
,
20
,
. . .
=
9
8
6
11
7
Question
2
2.
The
t
11
of an A.P. is
85
21
and the
t
13
is
33
7
.
Find
t
7
.
19
9
3
19
7
17
7
19
5
Question
3
3.
Find
S
25
of the A.P.
3
,
8
,
13
,
. . .
=
1577
1573
1575
1574
1576
Question
4
4.
How many terms of the A.P.
8
5
,
77
45
,
82
45
,
. . .
are needed to
make the sum
716
45
?
10
8
9
7
6
Question
5
5.
The common difference of the A.P.
9
5
,
68
35
,
73
35
,
. . .
=
1
9
1
7
3
7
(
-1
7
)
1
5
Question
6
6.
Given
t
n
=
27
, a =
3
, n =
7
, find d
4
5
3
7
2
Question
7
7.
The first term of the A.P.
1
7
,
11
28
,
9
14
,
25
28
,
8
7
,
. . .
=
9
14
11
28
8
7
25
28
1
7
Question
8
8.
If a =
160
and b =
178
,
the arithmetic mean of a and b =
171
168
170
169
166
Question
9
9.
If a =
41
20
and b =
23
10
,
the arithmetic mean of a and b =
87
38
17
8
87
40
89
40
29
14
Question
10
10.
The
t
5
of an A.P is
p
and
t
6
is
q
.
Find
t
14
and
t
n
.
(
−
3
p
+
5
q
)
,
(
−
p
n
+
11
p
+
q
n
−
9
q
)
(
−
7
p
+
8
q
)
,
(
−
p
n
+
6
p
+
q
n
−
5
q
)
(
−
8
p
+
9
q
)
,
(
−
p
n
+
6
p
+
q
n
−
5
q
)
(
−
9
p
+
10
q
)
,
(
−
p
n
+
5
p
+
q
n
−
4
q
)
(
−
8
p
+
9
q
)
,
(
−
p
n
+
p
+
q
n
−
q
)
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