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» Number Series
1
Which number would replace underline mark in the series.
1, 20, 58, ___ 191 ?
A) 105
B) 115
C) 91
D) None
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x
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1
Which number would replace underline mark in the series.
1, 20, 58, ___ 191
Answer:
A) 105
B)
115
C) 91
D) None
Explanation:
Here the difference between two consecutive terms
is 19, 38, 57, 76
= 58+57 = 115
2
Which number would come in place of the underline mark in the series.
1, 6, 26, ___, 426 ?
A) 86
B) 76
C) 96
D) 106
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2
Which number would come in place of the underline mark in the series.
1, 6, 26, ___, 426
Answer:
A) 86
B) 76
C) 96
D)
106
Explanation:
Here the difference between the consecutive terms is multiplied by 4
(i.e) the difference of the two consecutive numbers is 5, 20….
∴ 5 × 4 =20
20 × 4 = 80
∴ 26+80 = 106
3
Which number would come in place of the underline mark in the series.
2, 10, 40, 120, ____ ?
A) 240
B) 480
C) 120
D) 360
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x
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3
Which number would come in place of the underline mark in the series.
2, 10, 40, 120, ____
Answer:
A)
240
B) 480
C) 120
D) 360
Explanation:
Here the series is a multiplication series.
The order of the multiplication is ×5, ×4, ×3, ×2
2 × 5 = 10; 10 × 4 = 40; 40 × 3 = 120
∴ 120 × 2 = 240
4
3, 9, 21, ___, 93 ?
A) 39
B) 45
C) 48
D) 51
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4
3, 9, 21, ___, 93
Answer:
A) 39
B)
45
C) 48
D) 51
Explanation:
First difference is 6 and second is 12. But if we take
third as 18, then fourth difference will be 24.
Then 93 an not be the last term.
So We have to take the difference as 6, 12, 24 and 48.
So answer is 21+24=45.
5
2, 10, 26, 50, —122 ?
A) 80
B) 92
C) 82
D) 65
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5
2, 10, 26, 50, —122
Answer:
A) 80
B) 92
C)
82
D) 65
Explanation:
Here the series of the form (1
^{2}
+1), (3
^{2}
+1), (5
^{2}
+1),.....etc
6
15, 19, 16, —, 18, 14, 21, 13 ?
A) 19
B) 17
C) 20
D) 16
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6
15, 19, 16, —, 18, 14, 21, 13
Answer:
A) 19
B) 17
C) 20
D)
16
Explanation:
Here the series can be divided into two series and taking alternative terms.
1
^{st}
alternative ; 15, 16, 18, 21
2
^{nd}
alternative: 19, 16, 14, 13
7
8, 15, 28, 53, —, 199 ?
A) 101
B) 102
C) 105
D) 103
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7
8, 15, 28, 53, —, 199
Answer:
A) 101
B)
102
C) 105
D) 103
Explanation:
Here the series of the form is ×2-1, ×2-2, ×2-3, ×2-4, ×2-5
∴ 53×2 - 4=102
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Reasoning
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