Question Details

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?

Options

A

Only C

B

Only A

C

Both A and C

D

Both B and C

Show Answer

Correct Answer :

Option D

Both B and C

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:
12=1
32=9
52=25
72=49
92=81
112=121
132=169
152=225, 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:
(Odd Number)2+1
Thus, the differences between consecutive terms must be selected from the sequence:
12+1=2
32+1=10
52+1=26
72+1=50
92+1=82
112+1=122
132+1=170
152+1=226, 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: 82-32=50 (which is 72+1)
Second difference: 164-82=82 (which is 92+1)
Third difference: 286-164=122 (which is 112+1)
Fourth difference: 456-286=170 (which is 132+1)
Fifth difference: 682-456=226 (which is 152+1)
Since all differences (50, 82, 122, 170, 226) correspond to (consecutive odd numbers)2+1 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: 166-140=26 (which is 52+1)
Second difference: 216-166=50 (which is 72+1)
Third difference: 338-216=122 (which is 112+1)
Here, the difference jumps from 50 (for odd number 7) to 122 (for odd number 11), skipping the value 92+1=82 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: 410-400=10 (which is 32+1)
Second difference: 435-410=25 (Note that 25 is 52, not 52+1=26)
Third difference: 485-435=50 (which is 72+1)
Fourth difference: 567-485=82 (which is 92+1)
Fifth difference: 689-567=122 (which is 112+1)
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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