Subsequent terms in all the given three number series should follow the pattern “1 more than the square of consecutive odd numbers” .
A: 32, 82, 164, 286, 456, 682
B: 140, 166, 216, 338, 508, 798
C: 400, 410, 435, 485, 567, 689
Which of the following series does not follow the pattern?
Correct Answer :
Both B and C
Solution :
The correct option is Both B and C.
Let's analyze the pattern specified in the question:
"1 more than the square of consecutive odd numbers".
The consecutive odd numbers are: 1, 3, 5, 7, 9, 11, 13, 15, 17, ...
Their squares are:
, and so on.
The pattern "1 more than the square of consecutive odd numbers" means the difference between subsequent terms in the series must be of the form:
Thus, the differences between consecutive terms must be selected from the sequence:
, and so on.
Let's check each of the three series to see if the differences between consecutive terms follow this pattern:
Series A: 32, 82, 164, 286, 456, 682
Let's find the differences between consecutive terms:
First difference: (which is )
Second difference: (which is )
Third difference: (which is )
Fourth difference: (which is )
Fifth difference: (which is )
Since all differences (50, 82, 122, 170, 226) correspond to where the odd numbers are 7, 9, 11, 13, 15, Series A follows the pattern.
Series B: 140, 166, 216, 338, 508, 798
Let's find the differences between consecutive terms:
First difference: (which is )
Second difference: (which is )
Third difference: (which is )
Here, the difference jumps from 50 (for odd number 7) to 122 (for odd number 11), skipping the value which corresponds to the consecutive odd number 9. Thus, Series B does not follow the pattern of consecutive odd numbers.
Series C: 400, 410, 435, 485, 567, 689
Let's find the differences between consecutive terms:
First difference: (which is )
Second difference: (Note that 25 is , not )
Third difference: (which is )
Fourth difference: (which is )
Fifth difference: (which is )
Since the second difference is 25 instead of 26, Series C does not follow the pattern.
Therefore, both series B and C do not follow the pattern.
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