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Questions on Number Series
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Exercise
Number Series
Direction To Solve
Find out the wrong term in the given Number Series.
1
24, 27, 31, 33, 36
A.
24
B.
27
C.
31
D.
33
E.
None of these
View Answer(+)
Answer & Explanation
Answer

C
(31)
Explanation

Each term in the series is increased by 3 to obtain the next term. So 31 is wrong and must be replaced by (27+3)= 30
2
196, 169, 144, 121, 80
A.
80
B.
121
C.
169
D.
196
E.
None of these
View Answer(+)
Answer & Explanation
Answer

A
(80)
Explanation
 The sequence is (14)
^{2}
, (13)
^{2}
, (12)
^{2}
, (11)
^{2}
, (10)
^{2 }
hence 80 is wrong and must be rplaced by 100.
3
3, 5, 7, 9, 11, 13
A.
3
B.
5
C.
7
D.
9
E.
None of these
View Answer(+)
Answer & Explanation
Answer

D
(9)
Explanation
 The series consists of consecutive prime numbers. So 9 is wrong.
4
121, 143, 165, 186, 209
A.
143
B.
165
C.
186
D.
209
E.
None of these
View Answer(+)
Answer & Explanation
Answer

C
(186)
Explanation

Each term in the series is increased by 22 to obtain the next term. So 186 is wrong and must be replaced by (165+22) = 187
5
1, 2, 4, 8, 16, 32, 64, 96
A.
4
B.
32
C.
64
D.
96
E.
None of these
View Answer(+)
Answer & Explanation
Answer

D
(96)
Explanation

Each term of the series is obtained by multiplying the preceding term by 2.So, 96 is wrong answer and must be replaced by (64x2)=128
6
8, 14, 26, 48, 98, 194, 386
A.
14
B.
48
C.
98
D.
194
E.
None of these
View Answer(+)
Answer & Explanation
Answer

B
(48)
Explanation

Each term in the series is less than twice the preceding term by 2.So 48 is wrong answer and must be replaced by (26x2  2) = 50
7
8, 13, 21, 32, 47, 63, 83
A.
13
B.
21
C.
32
D.
47
E.
None of these
View Answer(+)
Answer & Explanation
Answer

D
(47)
Explanation

The sequence is +5, +8, +11, hence 47 is the wrong answer and must be replaced by (32+14) = 46
8
3, 10, 27, 4, 16, 64, 5, 25, 125
A.
3
B.
4
C.
10
D.
27
E.
None of these
View Answer(+)
Answer & Explanation
Answer

C
(10)
Explanation

The correct sequence is 3, 3
^{2}
, 3
^{3}
, 4, 4
^{2}
, 4
^{3}
, 5, 5
^{2}
, 5
^{3 }
therefore 10 is wrong and must be replaced by 3
^{2}
i.e. 9.
9
380, 188, 92, 48, 20, 8, 2
A.
188
B.
92
C.
48
D.
20
E.
None of these
View Answer(+)
Answer & Explanation
Answer

C
(48)
Explanation

Each term in the series is four more than two times the next term. So 48 is wrong and must be replaced by (20 x 2 + 4) = 44
10
1, 3, 7, 15, 27, 63, 127
A.
7
B.
15
C.
27
D.
63
E.
None of these
View Answer(+)
Answer & Explanation
Answer

C
(27)
Explanation

The sequence is +2, +4, +8, …. i.e. 2, +(2)
^{2}
, +(2)
^{3}
, …… so 27 is wrong and must be replaced by (15+(2)
^{4}
i.e., (15+16) or 31.
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