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- Question 1 of 24
1. Question
What is the next number in this sequence ?
1, 3, 8, 19, 42, 89, ..?..
Hint
Each of the numbers is doubled and 1, 2, 3, 4, 5, 6 is added in next term,
so, 89 × 2 + 6 = 184. - Question 2 of 24
2. Question
Which is the number that comes next in this sequence?
5, 16, 51, 158, ..?..
Hint
16 = 5 × 3 + 1, 51 = 16 × 3 + 3, 158 = 51 × 3 + 5
∴ Next term = 158 × 3 + 7 = 481 - Question 3 of 24
3. Question
Which one of the numbers will complete the series ?
8, 13, 10, 15, 12, 17, 14 ..?..
Hint
Second term is greater than first term by 5, while the third term is less than the second term by 3. The same order is repeated.
- Question 4 of 24
4. Question
Which one of the numbers will complete the series ?
6.25, 9, 12.25, 16, 20.25, 25, 30.25, ..?..
Hint
There are two alternate series
Series I: 6.25, 12.25, 20.25, 30.25 (sequence is +6, +8, +10)
Series II: 9, 16, 25, 36, (sequence is +7, +9, +11)
- Question 5 of 24
5. Question
What number will come next in the following series?
2, 2, 4, 4, 6, 8, 8, ..?..
Hint
The given series consists of 2 series
(i) 2, 4, 6, 8 ………….
(ii) 2, 4, 8 ………….
Series (i) → 2× 1, 2 × 2, 2 × 3 , 2 × 4 …….
Series (ii) → 2, 2× 2, 4 × 2, 8 × 2 = 16 ……. - Question 6 of 24
6. Question
What number will come next in the following series?
2, 12, 36, 80, 150, ..?..
Hint
1³ + 1² = 2, 2³ + 2² = 12, 3³ + 3² = 36 and so on
∴ 6³ + 6² = 252 - Question 7 of 24
7. Question
Which number will come next in the following set of numbers
3, 13, 53, 213 ..?..
Hint
The difference in consecutive numbers follows the sequence, 10, 40, 160.
So the next difference = 160 × 4 = 640
Therefore number = 213 + 640 = 853. - Question 8 of 24
8. Question
Which number will come next in the following set of numbers?
2, 5, 7, 12, 15, 17, 22 ..?..
Hint
2+3 = 5, 5+2 = 7, 7+5 = 12, 12+3 = 15, 15+2 = 17, 17+5 = 22.
Note that 3,2,5 are being added that order to various numbers to get the next number. Therefore, 3 should be added to 22 to get the answer. - Question 9 of 24
9. Question
Which number will come next in the following series
8,15,28,53, ..?..
Hint
8 × 2 – 1 = 15,
15 × 2 – 2 = 28,
28 × 2 – 3 = 53,
53 × 2 – 4 =102 - Question 10 of 24
10. Question
Which number will come next in the following series
3, 12, 27, 48, 75, 108, ..?..
Hint
The numbers are 3 × 1², 3 × 2², 3 × 3², 3 × 4², 3 × 5², 3 × 6², ……
∴ Missing number = 3 × 7² = 3 × 49 = 147 - Question 11 of 24
11. Question
Which numbers will come next in the following series?
1, 8, 9, 64, 25, 216, ..?.., ..?..
Hint
The odd terms are squares of the numbers 1, 3, 5, …. while the even terms are cubes of the numbers 2,4,6,….
- Question 12 of 24
12. Question
Which number will fit in the following series
3, 15, 4, 16, 5, 17, 6, ..?.., 7
Hint
There are two alternate series.
1st series : 3, 4, 5, 6, 7 …….. and so on.
2nd series : 15, 16, 17,18, 19 ……. and so on. - Question 13 of 24
13. Question
Find the missing term in the following series.
240, ..?.. 120, 40, 10, 2
Hint
Ratios of two consecutive terms are
1, ½, ⅓, ¼, and ⅕ respectively. - Question 14 of 24
14. Question
Which number will fit in the following series?
0, 7, 26, ..?.., 124, 215
Hint
Clearly the given series is 1³ – 1, 2³ – 1, 3³ – 1, 4³ – 1, 5³ – 1, 6³ – 1.
So, the missing number is 4³ – 1 = 63. - Question 15 of 24
15. Question
Which number will fit in the following series?
4, 16, 36, ..?.., 100, 144
Hint
The numbers in the series are square of 2,4,6 …,10,12 .
Therefore, the missing number is square of 8 i.e. 8² = 64. - Question 16 of 24
16. Question
Find the missing number in the series :
6, 12, 21, ..?.., 48
Hint
The common differences between the consecutive terms of the series are 6, 9, 12, 15, etc.
- Question 17 of 24
17. Question
Which one number does not belong to the series ?
3, 5, 8, 11, 17, 23
Hint
Differences between two consecutive terms are 2, 3, 4, 5 and 6 respectively.
- Question 18 of 24
18. Question
Which one number does not belong to the series ?
905, 180, 175, 35, 30, 6, 1
Hint
The sequence followed in the series is ÷5, –5 which is repeated.
∴ 900 should be in place of 905. - Question 19 of 24
19. Question
Which one of the numbers is wrong in the series given below ?
3, 2, 8, 9, 13, 22, 18, 32, 23, 42
Hint
There are 2 series :
3, 8, 13, 18, 23 and 2, 12, 22, 32, 42. Hence 9 is wrong. - Question 20 of 24
20. Question
Which one of the numbers is wrong in the series given below?
12, 18, 27, 90, 270, 945, 3780
Hint
If 27 is replaced by 36, then the ratios of two consecutive terms are 3/2, 2, 5/2, 3, …
- Question 21 of 24
21. Question
Find the wrong number in the series :
7, 28, 63, 124, 215, 342, 511
Hint
The series is
2³ – 1, 3³ – 1, 4³ – 1, 5³ – 1, 6³ – 1, 7³ – 1, 8³ – 1 - Question 22 of 24
22. Question
Which one number does not belong to the series ?
11, 2, 21, 3, 32, 4, 41, 5, 51, 6
Hint
The given sequence is a combination of two series:
I. 11, 21, 32, 41, 51 and II. 2, 3, 4, 5, 6
Clearly, the pattern in I is +10
So, 32 is wrong and should be replaced by (21 + 10) i.e. 31. - Question 23 of 24
23. Question
Which one of the numbers is wrong in the series given below ?
89, 78, 86, 80, 85, 82, 83
Hint
The sequence is –11, +9, –7, +5, –3, +1
So, 86 is wrong and should be replaced by (78 + 9) i.e. 87. - Question 24 of 24
24. Question
Which one of the numbers is wrong in the series given below ?
5, 10, 17, 24, 37
Hint
The sequence is +5, +7, …… .
So, 24 is wrong and should be replaced by (17 + 9) i.e. 26.
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