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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.
920818, 921223, 921419, 930101
920818
921223
921419
930101
930101
Split the 6-digit number into pairs (XX-XX-XX) and check if the sum of the digits of the first pair equals the value of the second pair or follows a consistent addition rule.
Split the 6-digit number into pairs (XX-XX-XX) and check if the sum of the digits of the first pair equals the value of the second pair or follows a consistent addition rule.
Analyze the Structure of the Numbers
Break each 6-digit number into three parts of two digits: 92-08-18, 92-12-23, 92-14-19, and 93-01-01.
Evaluate the Pattern for Options A, B, and C
For 920818: 9+2 = 11 (not matching 08), wait, let us try another: 9+2=11. Let's look at the difference: In 920818, 08+10=18. In 921223, 12+11=23. In 921419, 14+5=19. This is not uniform. Let us look at the sum of the first two digits: 9+2 = 11. In 920818, 8+1=9. In 921223, 2+3=5. In 921419, 1+9=10. This is also not uniform.
Re-evaluating the Pattern (Summation of digits)
Look at the sum of the last four digits: 08+18=26, 12+23=35, 14+19=33, 01+01=02. Check the difference between the first two digits and the last four: 920818 тЖТ 92 - 8 - 18 = 66. 921223 тЖТ 92 - 12 - 23 = 57. 921419 тЖТ 92 - 14 - 19 = 59. This is not it. Let's look at the first two digits: 92, 92, 92, 93. Option D starts with 93 while others start with 92.
A: It starts with 92, consistent with the group. B: It starts with 92, consistent with the group. C: It starts with 92, consistent with the group.
D is correct because 930101 is the only number that starts with 93, whereas all other options start with 92.
In numerical classification, always check for prefixes (first 2 digits) or suffixes first before attempting complex arithmetic operations, as many SSC/Railway questions rely on simple grouping.
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