If 
are in A.P. Then, x =
Here 
are in A.P
so 
–1/
= –2/ 
1/2 = (x + 2)/(x + 5)
x + 5= 2x + 4
x= 1
AI is thinking…
Couldn't generate an explanation.
Generated by AI. May contain inaccuracies — always verify with your textbook.
9. Arithmetic Progressions
1
2
3
1
2
3
4
5
6
7
8
9
10
11
12
1
2
2
2
2
2
3
3
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
1
2
3
4
5
6
7
8
1
2
3
4
5
5
5
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
Report submitted
Thank you — our team will review your report shortly.