Solved Problems
1. Look at this series: 14, 28, 20, 40, 32, 64,....
What number should come next?
Answer : 56
Explanation :
This is an alternating multiplication and subtracting series: First, multiply by 2 and then subtract 8.
2 . Look at this series: 4, 7, 25, 10, __, 20, 16, 19
What number should fill the blank?
Answer : 13
Explanation :
Two series alternate here, with every third number following a different pattern.
In the first series(odd position value), 3 is added to each number to arrive at the next.
In the second series(even position value), 5 is subtracted from each number to arrive at the next.
3. Look at the series and find the pair numbers.
10 20 25 35 40 50 55 ? ?
Answer : 65 70
Explanation :
This is an alternating addition series.
In which 10 is added, then 5, then 10, and so on.
4 . Look at this series: 664, 332, 340, 170, __, 89
What number should fill the blank?
Answer : 178
Explanation :
This is an alternating division and addition series.
The number is divide by 2, and then add 8.
5. Look at the series 72, 76, 73, 77, 74, __, 75
What number should fill the blank?
Answer : 78
Explanation :
This is an alternating addition subtraction series.
In which addition of 4 and the subtraction of 3.
6. Look at this series and find the pair numbers.
6 20 8 14 10 8 12 ....
Answer : 2 14
Explanation :
This is an alternating addition and subtraction series.
In the first pattern, 2 is added to each number to arrive at the next.
In the alternate pattern, 6 is subtracted from each number to arrive at the next.
7. Look at the series 201, 202, 204, 207, __
What number should come next?
Answer : 211
Explanation :
In this addition series, 1 is added to the first number.
The number 2 is added to the second number; 3 is added to the third number.
The number 4 is added to the fourth number; and go on.
8. Look at this series and find the pair numbers.
21 25 18 29 33 18......
Answer : 37 41
Explanation :
This is a simple addition series with a random number, 18, interpolated as every third number.
In the series, 4 is added to each number except 18, to arrive at the next number.
9. Look at this series and find the pair numbers.
61 57 50 61 43 36 61.....
Answer : 29 22
Explanation :
This is an alternating repetition series.
In which a random number, 61, is interpolated as every third number into an otherwise simple subtraction series.
Starting with the second number, 57, each number (except 61) is 7 less than the previous number.
10. Look at this series: 83, 73, 93, 63, __, 93, 43
What number should fill the blank?
Answer : 53
Explanation :
This is a simple subtraction series.
In which a random number, 93, is interpolated as every third number.
In the subtraction series, 10 is subtracted from each number to arrive at the next.
11. Look at this series: 2, 3, 5, 7, 11, ?, 17
What number should fill the blank?
Answer : 13
Explanation :
The given series consists of prime numbers starting from 2.
The prime number after 11 is 13.
So, 13 is the missing number.
12. L ook at this series and find the pair numbers.
8 22 12 16 22 20 24 ....
Answer : 22 28
Explanation :
This is an alternating repetition series, with a random number, 22, interpolated as every third number into an otherwise simple addition series.
In the addition series, 4 is added to each number to arrive at the next number.
13. Look at this16. Look at this series: 14, 28, 20, 40, 32, 64,....
What number should come next?
Answer : 56
Explanation :
This is an alternating multiplication and subtracting series: First, multiply by 2 and then subtract 8
14. Look at this series and find the pair numbers.
18 21 25 18 29 33 18....
Answer : 37 41
Explanation :
This is a simple addition series with a random number, 18, interpolated as every third number.
In the series, 4 is added to each number except 18, to arrive at the next number.
15. Look at this series 1, 6, 13, 22, 33,..... What number should fill the blank?
Answer : 46
Explanation :
This is a simple addition series. The pattern is + 5, + 7, + 9, + 11,...
Missing number = 33 + 13 = 46.
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