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Class VI
Class VII
Class VIII
Class IX
Class X
CBSE Grade X - Arthimetic Progressions
Question
1
1.
How many terms of the A.P.
2
9
,
7
18
,
5
9
,
. . .
are needed to
make the sum
125
6
?
12
14
15
16
18
Question
2
2.
Find
t
25
of the A.P.
7
2
,
23
6
,
25
6
,
. . .
=
25
2
21
2
23
23
2
23
4
Question
3
3.
Determine
t
6
and
t
n
of an A.P. whose
t
9
is
77
and
t
7
is
59
.
48
;
(
7
n
−
4
)
52
;
(
12
n
−
4
)
51
;
(
9
n
+
1
)
50
;
(
9
n
−
4
)
49
;
(
9
n
+
5
)
Question
4
4.
If a =
78
and b =
92
,
the arithmetic mean of a and b =
88
84
82
86
85
Question
5
5.
Find the sum of the following A.P. series
(
x
+
6
y
)
,
7
y
,
(
−
x
+
8
y
)
. . .
to
8
terms
(
−
20
x
+
76
y
)
(
−
15
x
+
64
y
)
(
−
25
x
+
39
y
)
(
−
13
x
+
62
y
)
(
−
27
x
+
27
y
)
Question
6
6.
Find
S
9
of the A.P.
4
7
,
31
42
,
19
21
,
. . .
=
80
7
76
7
78
7
26
3
78
5
Question
7
7.
The sum of first n natural number is
(
n
)
(
n
+
1
)
(
2
n
+
1
)
6
(
n
)
(
n
+
1
)
2
(
n
)
(
n
−
1
)
2
n
2
(
n
+
1
)
2
4
(
n
−
1
)
(
n
+
1
)
2
Question
8
8.
Find the next
4
terms of the following A.P.
(
−
2
a
+
9
b
)
,
(
4
a
+
15
b
)
,
(
10
a
+
21
b
)
,
. . .
(
18
a
+
18
b
)
,
(
24
a
+
24
b
)
,
(
30
a
+
30
b
)
,
(
36
a
+
36
b
)
(
14
a
+
36
b
)
,
(
20
a
+
42
b
)
,
(
26
a
+
48
b
)
,
(
32
a
+
54
b
)
(
22
a
+
33
b
)
,
(
28
a
+
39
b
)
,
(
34
a
+
45
b
)
,
(
40
a
+
51
b
)
(
8
a
+
30
b
)
,
(
14
a
+
36
b
)
,
(
20
a
+
42
b
)
,
(
26
a
+
48
b
)
(
16
a
+
27
b
)
,
(
22
a
+
33
b
)
,
(
28
a
+
39
b
)
,
(
34
a
+
45
b
)
Question
9
9.
The first term of the A.P.
3
8
,
5
8
,
7
8
,
9
8
,
11
8
,
. . .
=
9
8
5
8
11
8
3
8
7
8
Question
10
10.
If a =
14
15
and b =
4
3
,
the arithmetic mean of a and b =
1
17
15
17
13
19
15
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