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# Logical Reasoning :: Number Series

Home > Logical Reasoning > Number Series > General Questions

81. Find the next term of the following series.
1, 3, 1, 2.5, 5, 1, 4, 5, 4, 8, 7, ?

| | | Asked In |

Answer: Option B

Explanation:

1+3+1=5
5/2=2.5
5+1+4=10
10/2=5
4+8+7=19
19/2=9.5

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Tags:  IBM

82. Find the next term of the following series.
1, 1, 3, 2, 1, 5, 3, 4, 10, 4, 2, ?

| | | Asked In |

Answer: Option A

Explanation:

1+1=2+1=3
2+1=3+2=5
3+4=7+3=10
4+2=6+4=10

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Tags:  IBM

83. Find the next term of the following series.
5, 5, 7, 7, 9, 11, 11, 13, 13, 17, 15, 19, 17, ?

| | | Asked In |

Answer: Option D

Explanation:

5+2=7
7+4=11
11+2=13
13+4=17
17+2=19
19+4=23
so the answer is 23

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84. Find the next term of the following series.
7 -35 -34 -3 15 16 4 ?

| | | Asked In |

Answer: Option C

Explanation:

7* -5 =-35
-35+1=36
-3*-5=15
15+1=16
4*-5=-20
-20+1=-19

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Tags:  IBM

85. In this question, one term in the number series is wrong. Find out the wrong term
93, 309, 434, 498, 521, 533

| | | Asked In |

Answer: Option D

Explanation:

93 + 6^3 = 309
309 + 5^3 = 434
434 + 4^3 = 498
498 + 3^3 = 525 (not 521)
525 + 2^3 = 533

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Tags:  IBM

86. In this question, one term in the number series is wrong. Find out the wrong term
1, 5, 5, 9, 7, 11, 11, 15, 12, 17

| | | Asked In |

Answer: Option B

Explanation:

Separate the series as below.
1,5,7,11,12
5,9,11,15,17
Both series have the rule of adding +4 then +2 alternatively,
Like 5, 5+4=9, 9+2=11, 11+4=15, 15+2=17
But in the first series, 1, 1+4=5, 5+2=7, 7+4=11, 11+2=13 not 12

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Tags:  IBM

87. In this question, one term in the number series is wrong. Find out the wrong term
3, 4, 10, 32, 136, 685, 4116

| | | Asked In |

Answer: Option B

Explanation:

3*1+1=4
4*2+2=10
10*3+3=33
So 32

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Tags:  IBM

88. Find the next term of the following series.
-5,1,-11,23,29,17,-20,-14

| | | Asked In |

Answer: Option A

Explanation:

(-5) *2 = -10 - (1) = -11
(23) *2 = 46 - (29) = 17
(-20) *2 = -40 - (-14) = -26

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Tags:  IBM

89. Find the next term of the following series.
0, 1, 2, 0.5, 2, 3, 5, 1, 2, 0, 2, 1, 4, 2, 3, ?.

| | | Asked In |

Answer: Option A

Explanation:

0+1=1=>1/2=0.5
2+3=5=>5/5=1
2+0=2=>2/2=1
4+2=6=>6/3=2

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Tags:  IBM

90. Find the next term of the following series.
40, 39, 37, 33, 26, 15, ?.

| | | Asked In |

Answer: Option D

Explanation:

40-39=1
39-37=2
37-33=4
33-26=7
26-15=11
15-13=2

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Tags:  IBM