1. 50, 26, 14, 8, 5, _
A. 4
B. 3
C. 3.5
D. 2.5
E. 4.5
Sol. 50/2 + 1 = 26
26/2 + 1 = 14
14/2 + 1 = 8
8/2 + 1 = 5
5/2 + 1 = 3.5
2. 4, 12, 60, 420, _, 41580
A. 4620
B. 3780
C. 4200
D. 5040
E. None of these
Sol. 4*3 = 12
12*5 = 60
60*7 = 420
420*9 = 3780
3780*11= 41580
3. 4, 3, 12, 6, 36, 9, 108, 12, _
A. 324
B. 252
C. 156
D. 182
E. 236
Sol. It is a double series.
*3 : 4, 12, 36, 108
+3 : 3, 6, 9, 12
4. 36, 202, 44, 290, _
A. 52
B. 42
C. 48
D. 50
E. 56
Sol. 10^2 - 8^2 = 36
11^2 + 9^2 = 202
12^2 - 10^2 = 44
13^2 + 11^2 = 290
14^2 - 12^2 = 52
5. 5, 11, 24, 44, 71, _
A. 102
B. 105
C. 112
D. 101
E. None of these
Sol. 5 + 6 = 11
11 + 13= 24
24 + 20= 71
71 + 27= 105
13 - 6 = 7
20 - 13= 7
27 - 20= 7
6. 7, 15, 28, 59, 114, _
A. 225
B. 228
C. 233
D. 240
E. None of these
Sol. 7*2 + 1 = 15
15*2 - 2 = 28
28*2 + 3 = 59
59*2 - 4 = 114
114*2 + 5 = 233
7. 2, 4, 10, 22, 42, _
A. 65
B. 64
C. 70
D. 72
E. 76
Sol. 2 + 2 = 4
4 + 6 = 10
10 + 12= 22
22 + 20= 42
42 + 30= 72
6 - 2 = 4
12 - 6 = 6
20 - 12= 8
30 - 20= 10
8. 4, 16, 26, 34, 40, _
A. 44
B. 42
C. 40
D. 46
E. None of these
Sol. 4 + 12 = 16
16 + 10 = 26
26 + 8 = 34
34 + 6 = 40
40 + 4 = 44
9. 16, 17, 13, 22, 6, _
A. 25
B. 15
C. 31
D. 17
E. None of these
Sol. 17 - 16 = 1
13 - 17 = -4
22 - 13 = 9
6 - 22 = -16
31 - 6 = 25
10. 584, 588, 580, 592, ?
A. 560
B. 576
C. 550
D. 500
E. None of these
Sol. +4 -8 +12 -16....
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