Quantitative Aptitude - Number series
Questions:
Find out the missing number in the place of ‘?’ below:
1. 36 20 ? 8 6
a. 10 b. 12 c. 14 d. 16 e. None of these
2. 668 656 632 584 ? 296
a. 392 b. 438 c. 488 d. 536 e. None of these
3. 1 121 441 961 1681 ?
a. 2701 b. 2511 c. 2611 d. 2801 e. None of these
4. 9 49 201 1009 ? 20209 80841
a. 4054 b. 4049 c. 4050 d. 4041 e. None of these
5. 31 35 44 60 85 ?
a. 121 b. 111 c. 109 d. 97 e. None of these
6. 11 13 16 20 ?
a. 24 b. 26 c. 27 d.28 e. None of these
7. 7 13 25 49 ?
a. 99 b. 97 c. 89 d. 87 e. None of these
8. 608 304 152 76 ?
a. 39 b. 38 c. 37 d. 36 e. None of these
9. 8 9 20 63 ?
a. 256 b. 252 c. 246 d. 242 e. None of these
10. 5 6 10 19 ?
a. 28 b.37 c.36 d. 35 e. None of these
Answers:
1. 12
The sequence is -16, -8, -4, -2, -1
2. 488
The sequence is -12, -24, -48, -96, -192
3. None of these
The sequence is 12 , 112, 212, 312, 412, 512
4. 4041
The sequence is *5+4, *4+5 alternatively
5. 121
The sequence is +22, +32, +42, +52, +62
6. None of these, correct answer is 25
The sequence is +2, +3, +4, +5
7. 97
The sequence is *2-1
8. 38
The sequence is *1/2
9. 256
The sequence is *1+1, *2+2, *3+3, *4+4
10. 35
The sequence is +12, +22, +32, +42
