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Class VI
Class VII
Class VIII
Class IX
Class X
CBSE Grade X - Arthimetic Progressions
Question
1
1.
Find
t
18
of the A.P.
3
8
,
29
56
,
37
56
,
. . .
=
155
56
157
58
157
54
157
56
159
56
Question
2
2.
If a =
1
and b =
9
,
the arithmetic mean of a and b =
5
3
6
4
8
Question
3
3.
Given
t
n
=
51
, d =
9
, n =
6
, find
S
n
168
172
170
171
174
Question
4
4.
Find the common difference and next four terms of the
following A.P.
3
,
11
,
19
,
. . .
=
8
;
27
,
35
,
43
,
51
9
;
27
,
35
,
43
,
51
9
;
24
,
31
,
38
,
45
9
;
30
,
39
,
48
,
57
Question
5
5.
If
S
80
and
S
40
of an A.P. are
25600
and
6400
respectively, then
S
120
=
57597
57601
57602
57600
Question
6
6.
Find the sum of the following A.P. series
(
x
+
3
y
)
,
12
y
,
(
−
x
+
21
y
)
. . .
to
7
terms
(
−
18
x
+
186
y
)
(
−
8
x
+
144
y
)
(
−
10
x
+
162
y
)
(
−
14
x
+
210
y
)
(
−
20
x
+
180
y
)
Question
7
7.
The common difference of the A.P.
9
,
17
,
25
,
. . .
=
7
9
11
8
6
Question
8
8.
The
t
14
of an A.P. is
58
and the
t
6
is
26
.
Find
t
17
.
67
72
70
69
71
Question
9
9.
The product of two numbers is
3584
and their arithmetic mean is
60
.
Find the two numbers.
(
57
,
65
)
(
56
,
64
)
(
58
,
64
)
(
56
,
63
)
(
66
,
58
)
Question
10
10.
If a =
7
6
and d =
1
8
, find
t
2
of the A.P.
29
24
31
22
31
24
11
8
31
26
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