Dear Aspirants,
As some of the slots of RBI Assistant Prelims are over , we bring you the "Number Series" questions asked in the exams. Keep checking our blog for more asked questions as we are going to update as soon as the other slots are over.
Directions(1-10): What should come in place of question mark(?) in the following series:
1. 15, 22, 32, 46, 65, ?
A. 90
B. 80
C. 70
D. 75
E. None of these
Sol. A)90
Difference of the difference is in A.P. 3, 4, 5, 6.
2. 7, 21, 5, 23, ?, 25
A. 4
B. 3
C. 2
D. 1
E. None of these
Sol. B)3
Alternating double series,
7 - 5 = 2
5 - 3 = 2
23 - 21 = 2
25 - 23 = 2
3. 9, 10, 18, 27, 91 ?
A. 115
B. 114
C. 116
D. 120
E. None of these
Sol. C)116
The pattern is 1², 2³, 3², 4³, 5².
4. 17, 23, 35, 59, ?, 205
A. 107
B. 108
C. 106
D. 105
E. None of these
Sol. A)107
The pattern is +6, +12, +24, +48.
5. 6, 7, 16, 51, 208, ?
A. 1050
B. 1045
C. 1020
D. 1065
E. None of these
Sol. B)1045
The pattern is *1 + 1, *2 + 2, *3 + 3, *4 + 4, *5 + 5.
6. 11, 12, 26, 81, 328, ?
A. 1545
B. 1645
C. 1845
D. 1945
E. None of these
Sol. B)1645
The pattern is *1 + 1, *2 + 2, *3 + 3, *4 + 4, *5 + 5.
7. 4, 11, 24, 44, 72, ?
A. 110
B. 112
C. 109
D. 106
E. None of these
Sol. C)109
Difference of the difference is in A.P. 6, 7, 8, 9.
8. 11, 12, 20, 29, 93, ?
A. 115
B. 112
C. 118
D. 120
E. None of these
Sol. C)118
The pattern is 1², 2³, 3², 4³, 5².
9. 17, 25, 15, 27, 13, ?
A. 30
B. 32
C. 36
D. 29
E. None of these
Sol. D)29
The double alternating series,
17 - 15 = 2
15 - 13 = 2
27 - 25 = 2
29 - 27 = 2.
10. 13, 21, 37, 69, 133,
A. 261
B. 267
C. 265
D. 263
E. None of these
Sol. A)261
The pattern is + 8*1, + 8*2, + 8*4, + 8*8, + 8*16.
Important Note:
As some of the slots of RBI Assistant Prelims are over , we bring you the "Number Series" questions asked in the exams. Keep checking our blog for more asked questions as we are going to update as soon as the other slots are over.
Directions(1-10): What should come in place of question mark(?) in the following series:
1. 15, 22, 32, 46, 65, ?
A. 90
B. 80
C. 70
D. 75
E. None of these
Sol. A)90
Difference of the difference is in A.P. 3, 4, 5, 6.
2. 7, 21, 5, 23, ?, 25
A. 4
B. 3
C. 2
D. 1
E. None of these
Sol. B)3
Alternating double series,
7 - 5 = 2
5 - 3 = 2
23 - 21 = 2
25 - 23 = 2
3. 9, 10, 18, 27, 91 ?
A. 115
B. 114
C. 116
D. 120
E. None of these
Sol. C)116
The pattern is 1², 2³, 3², 4³, 5².
4. 17, 23, 35, 59, ?, 205
A. 107
B. 108
C. 106
D. 105
E. None of these
Sol. A)107
The pattern is +6, +12, +24, +48.
5. 6, 7, 16, 51, 208, ?
A. 1050
B. 1045
C. 1020
D. 1065
E. None of these
Sol. B)1045
The pattern is *1 + 1, *2 + 2, *3 + 3, *4 + 4, *5 + 5.
6. 11, 12, 26, 81, 328, ?
A. 1545
B. 1645
C. 1845
D. 1945
E. None of these
Sol. B)1645
The pattern is *1 + 1, *2 + 2, *3 + 3, *4 + 4, *5 + 5.
7. 4, 11, 24, 44, 72, ?
A. 110
B. 112
C. 109
D. 106
E. None of these
Sol. C)109
Difference of the difference is in A.P. 6, 7, 8, 9.
8. 11, 12, 20, 29, 93, ?
A. 115
B. 112
C. 118
D. 120
E. None of these
Sol. C)118
The pattern is 1², 2³, 3², 4³, 5².
9. 17, 25, 15, 27, 13, ?
A. 30
B. 32
C. 36
D. 29
E. None of these
Sol. D)29
The double alternating series,
17 - 15 = 2
15 - 13 = 2
27 - 25 = 2
29 - 27 = 2.
10. 13, 21, 37, 69, 133,
A. 261
B. 267
C. 265
D. 263
E. None of these
Sol. A)261
The pattern is + 8*1, + 8*2, + 8*4, + 8*8, + 8*16.
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