Series MCQ for SBI PO/Clerk 2018: 22 May

Directions (Q. 1-10): Find the number in place of question mark (?) in the following number series.
1. 3    81     ?     1029     2187     3993
        1) 375       2) 648       3) 192       4) 575       5) 243

2. 30    45     75     105     165     ?
        1) 185       2) 205       3) 215       4) 195       5) 230

3. 8     24     12     36     18     54     ?
        1) 64         2) 79         3) 34         4) 37         5) 27

4. 4320     720     144     ?     12     6     6
        1) 56         2) 60         3) 26         4) 36         5) 16

5.  26   63     124     215     342     ?
        1) 511      2) 509     3) 504     4) 515     5) 525

6.  529    841     961     1369     1681     1849     ?
1) 2809                  2) 3249                  3) 2208

4) 6424                  5) 2209
7.  1108    1117     1142     1191     ?               1481
1) 1312                  2) 1272                  3) 1300

4) 1204                  5) None of these
8.  841    961     1089     1225     1369     1521     ?
1) 1785                  2) 1581                  3) 1681
4) 1881                  5) 1781

9.  12    14     32     102     416     2090      ?
1) 15522                2) 12552                3) 13525
4) 17552                5) None of these

10.  384     381     372     345     264     ?
1) 25                       2) 27                       3) 44
4) 49            5) None of these


Answers:

1. 1; The series is 1³× 3, 3³× 3, 5³ × 3,             7³ × 3, …
2. 4; Each number is a prime number multiplied by 15.Thus, the series is 15 × 2, 15 × 3, 15 × 5, 15 × 7, 15 × 11, …
3. 5; The series is ×3, ÷2, ×3, ÷2, …
4. 4; The series is ÷6, ÷5, ÷4, ÷3 …
5. 1; The series is (3³– 1), (4³– 1), (5³ – 1), (6³ – 1), (7³ – 1) …
6. 5; The series is 23², 29², 31², 37²…
7. 1; The series is +3², +5², +7², +11², +13², …
8. 3; The series is +120, +128, + 136, +… +160, …
9. 2; The series is ×1 + 2, ×2 + 4, ×3 + 6, ×4 + 8, ×5 + 10, ×6 + 12 …
10. 5; The series is –3, –9, –27, –81, –243 …