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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.
220312, 220415, 220829, 240716
220312
220415
220829
240716
240716
Split the 6-digit number into two halves (3 digits each). Check if the second half is 3 times the first 3 digits or follows a specific mathematical relation.
Split the 6-digit number into two halves (3 digits each). Check if the second half is 3 times the first 3 digits or follows a specific mathematical relation.
Divide into pairs
Split each number into two sets of 3 digits: (220, 312), (220, 415), (220, 829), (240, 716).
Analyze the relationship
In Options A, B, and C, the first 3 digits are constant (220). For Option D, the first 3 digits are 240, which disrupts the constant prefix pattern shared by the other three numbers.
Verify alternative mathematical logic
Alternatively, sum the digits: 2+2+0+3+1+2 = 10; 2+2+0+4+1+5 = 14; 2+2+0+8+2+9 = 23; 2+4+0+7+1+6 = 20. Another observation is that 220312, 220415, and 220829 all start with 220, while 240716 does not.
A: 220312 follows the 220 prefix pattern, B: 220415 follows the 220 prefix pattern, C: 220829 follows the 220 prefix pattern.
D is correct because it is the only number among the four that does not start with the prefix 220.
In classification questions involving long strings of digits, always check for common prefixes or suffixes first before moving to complex arithmetic operations like summation or divisibility.
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