Number Series Logical Reasoning
Find out what should come in place of the Question mark (?) in the following number series
Q1. 4, 9, 19, 34, ?
(A) 39
(B) 54
(C) 69
(D) 82
Answer: (B) 54
Add an aditional 5 to each number
Q2. 1, 6, 13, 22, 33, ?
(A) 43
(B) 44
(C) 45
(D) 46
Answer: (D) 46
Add numbers in the series of 5, 7, 9, 11...
Q3. 5, 8, 6, 9, 7, ?
(A) 10
(B) 11
(C) 12
(D) 15
Answer: (A) 10
Each alternating number is an addition of 1
Q4. 2, 5, 11, 23, 47, ?
(A) 63
(B) 86
(C) 95
(D) 118
Answer: (C) 95
Numbers are added by 3X1=3, 3X2=6, 6X2=12, 12X2=24,....
Q5. 36, 34, 30, 28, 24, ?
(A) 20
(B) 22
(C) 21
(D) 18
Answer: (B) 22
Numbers are subtracted by 2 and 4 alternately
Q6. 63, 63, 50, 50, 37, 37, ?
(A) 23
(B) 25
(C) 24
(D) 27
Answer: (C) 24
Each repeated number is subtracted by 13
Q7. 2, 6, 18, 54, ?
(A) 84
(B) 112
(C) 146
(D) 162
Answer: (D) 162
Each number is multiplication of 3 with previous number
Q8. 1, 8, 27, 64,
?
(A) 86
(B) 112
(C) 125
(D) 146
Answer: (C) 125
Each number is cubes of 1,2,3.... serialy
Q9. 7.5, 6.8, 6.1,
5.4,
?
(A) 4.9
(B) 4.7
(C) 4.3
(D) 3.9
Answer: (B) 4.7
Each number is subtraction of 0.7 from previous number
Q10. 0, 6, 24, 60, ?,
210
(A) 92
(B) 108
(C) 120
(D) 148
Answer: (C) 120
0X1X2=0, 1X2X3=6, 2X3X4=24, 3X4X5=60,...
Q11. 1, 3, 4, 7, 11,
18, 29, ?
(A) 31
(B) 39
(C) 43
(D) 47
Answer: (D) 47
Each number is the addition of previous two numbers
Q12. 975, 864, 753, 642, ?
(A) 431
(B) 314
(C) 531
(D) 532
Answer: (C) 531
Each number is substraction of 111
Q13. 8, 24, 12, ?, 18,
54
(A) 28
(B) 36
(C) 46
(D) 38
Answer: (B) 36
8X3=24, 12X3=36, 18X3=54
Q14. 9, 61, 52, 63, 94, ?
(A) 18
(B) 46
(C) 19
(D) 42
Answer: (B) 46
9-->9=3², 61-->16=4², 52-->25=5², 63-->36=6²....
Q15. 5, 17, 37, 65, ?,
145
(A) 95
(B) 97
(C) 99
(D) 101
Answer: (D) 101
2²+1=5, 4²+1=17, 6²+1=37, 8²+1=65, 10²+1=101,....
Practice Test Exam