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In the following, four roll numbers or centre codes are given. Three share a common pattern or belong to one group, but one is different. Select the odd one out.
701098, 700534, 700199, 900301
701098
700534
700199
900301
900301
Observe the first digit of the numbers. Three options start with 7, whereas one option starts with 9, making it the odd one out.
Observe the first digit of the numbers. Three options start with 7, whereas one option starts with 9, making it the odd one out.
Analyze the pattern of the first digits
Examining the numbers: 701098, 700534, 700199, and 900301. Notice that the first digit of 701098 is 7, the first digit of 700534 is 7, and the first digit of 700199 is 7.
Identify the anomaly
The number 900301 begins with the digit 9. Since all other numbers in the set share the common prefix 7, 900301 does not belong to this group.
A: 701098 shares the prefix 7; B: 700534 shares the prefix 7; C: 700199 shares the prefix 7.
D is correct because it is the only number in the set that starts with the digit 9, while the remaining numbers all start with the digit 7.
In numerical classification questions, always check properties like starting digits, sum of digits, or divisibility first as they are the most common patterns in competitive exams.
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