Number Series Completion - General Inteligence & Reasoning MCQ Questions and Answers

1

What will come at the place of question mark ?
1, 9, 25, 49, ?, 121.

A) 100 B) 91 C) 64 D) 81

Discuss

Answer & Solution

Answer: Option D

Solution:

1² = 1.
3² = 9.
5² = 25.
7² = 49.
9² = 81.
11² = 121.

2

What will come at the place of question mark?
4, 7, 12, 19, 28, ?

A) 49 B) 36 C) 30 D) 39

Discuss

Answer & Solution

Answer: Option D

Solution:

First term : 4
Second term: 4+3 = 7
Third term : 7+5 = 12
Fourth term : 12+7 = 19.
Fifth term : 19+9 = 28.
Therefore,
Next Terms : 28+11 = 39

3

What will come at the place of question mark ?
6, 11, 21, 36, 56, ?

A) 91 B) 61 C) 81 D) 71

Discuss

Answer & Solution

Answer: Option C

Solution:

6 (+5)→ 11 (+10)→ 21 (+15)→ 36 (+20)→ 56 (+25) → 81.

4

What will come at the place of question mark ?
10, 100, 200, 310, ?

A) 430 B) 420 C) 410 D) 400

Discuss

Answer & Solution

Answer: Option A

Solution:

1st term : 10
2nd term : 100 = 10+90
3rd term : 200 = 100+100
4th term : 310 = 200+110
5th Term: 430 = 310+120

Therefore, the answer is 430.

5

What will come at the place of question mark ?
8, 28, 116, 584, ?

A) 1752 B) 3504 C) 3508 D) 3502

Discuss

Answer & Solution

Answer: Option C

Solution:

(8 *3) + 4 = 28 (28 *4) + 4 = 116 (116 *5) + 4 = 584 (584 *6) + 4 = 3508.

6

What will come at the place of question mark ?
3, 7, 23, 95, ?

A) 62 B) 128 C) 479 D) 575

Discuss

Answer & Solution

Answer: Option C

Solution:

1st number = 3
2nd number = 3 x 2 +1 = 7
3rd number = 7 x 3 + 2 = 23
4th number = 23 x 4 + 3 = 95
5th number = 95 x 5 + 4 = 479

7

What will come at the place of question mark ?
7, 26, 63, 124, 215, 342, ?

A) 391 B) 511 C) 481 D) 421

Discuss

Answer & Solution

Answer: Option B

Solution:

The terms are given in a series
(2³ -1) = 7
(3³ -1) = 26
(4³ -1) = 63
(5³ -1) = 124
(6³ -1) = 215
(7³ -1) = 342
So, the missing term is,
(8³ -1) = 511.

8

What will come at the place of question mark ?
165, 195, 255, 285, 345, ?

A) 390 B) 420 C) 435 D) 375 E) Two answer out of four option

Discuss

Answer & Solution

Answer: Option E

Solution:

Solution 1: Each number of given series is 15 multiplied by a prime number.
15*11, 15*13, 15*17, 15*19, 15*23.
So, Missing number is
15*29 = 435.

Solution 2: This pattern is +30 and then +60 also follow for the give series.
165+30=195,
195+60=255,
255+30=285,
285+60=345,
345+30=375

9

34, 45, 56, 67, ....... What number should come next?

A) 78 B) 73 C) 82 D) 84

Discuss

Answer & Solution

Answer: Option A

Solution:

34(+11) → 45(+11) → 56(+11) →67 (+11) → 78.

10

What will come at the place of question mark ?
3, 2, 7, 6, 11, ?

A) 8 B) 10 C) 4 D) 2

Discuss

Answer & Solution

Answer: Option B

Solution:

2^nd number is less by 1 than the 1^st number and 3^rd number is more by 5 than the 2^nd number. The same rule follows in other numbers of the series.