## Series Completion: General Intelligence or Reasoning MCQ Question with Answer

This chapter deals with questions in which series of numbers or alphabetical letters are given, which are generally called as terms of the series. These terms follow a certain pattern throughout. The candidate is required to recognize this pattern and either complete the given series with the most suitable alternative or find the wrong term in the series.

Quiz-1 | Quiz-2 | Quiz-3 | Quiz-4 | Quiz-5 |

Direction: What should come in place of question mark (?) in the following number series?

Q1. 24, 21, 18, ?, 12, 9

(a) 10

(b) 15

(c) 14

(d) 16

or ? = 15

Q2. 7, 12, 19, ?, 39

(a) 24

(b) 26

(c) 28

(d) 30

∴ Missing number = 19 + 9 = 28.

Q3. 2, 4, 8, 14, 22, 32, ?

(a) 40

(c) 42

(c) 44

(d) 46

∴ Missing number = 32+12=44.

Q4. 0, 6, 24, 60, 120, 210 ?

(a) 250

(b) 290

(c) 325

(d) 336

^{3}– 1, 2

^{3}– 2, 3

^{3}– 3, 4

^{3}– 4. 5

^{3}– 5. 6

^{3}–6,

∴ Next number = 7^{3} – 7 = 343 – 7 = 336.

Q5. 4, 6. 12, 14, 28, 30, ( ?)

(a) 32

(b) 60

(c) 62

(d) 64

I ⇒ 4. 12, 28, ( ) and II⇒ 6. 14, 30.

Now, the pattern followed in each of the above two series is : + 8, + 16. + 32

So. missing number = (28 + 32) = 60.

Q6. 3, 4, 6, 9, 13, 18, ?

(a) 22

(b) 24

(c) 26

(d) 28

∴ Next number = 18 + 6 = 24

Q7. 6174, 882, 126, ?

(a) 18

(b) 20

(c) 24

(d) 30

∴ Next number = 126/7 = 18

Q8. 1. 3, 3, 6, 7, 9, ?, 12, 21.

(a) 10

(b) 11

(c) 12

(d) 13

I → 1, 3, 7, ?, 21 and II → 3, 6, 9, 12

The pattern followed in I is + 2. + 4, +6, +8 .; and the pattern followed in II is + 3, +3, +3

∴ missing number = 7 + 6 = 13.

Q9. In the series 357, 363, 369, …. what will be the 10th term ?

(a) 405

(b) 411

(c) 413

(d) 417

10th term = a (10 – 1)d = a + 9d = (357 + 9 x 6) = (357 + 54) = 411.

Q10. 1, 4, 9. 16, 25, (? )

(a) 35

(b) 36

(c) 48

(d) 49

^{2}, 2

^{2}, 3

^{2}, 4

^{2}, ….

∴ missing number = 6^{2}