Question : Directions: Below are given some Roll Numbers of candidates registered at different centers for examination. The first two digits from the left stand for the center code and the next four for the serial number of the candidates registered at the center.

Now answer the following question based on this sample of Roll Numbers.
Which of the following center pairs had common serial number candidates?
Option 1: 83 and 65
Option 2: 56 and 65
Option 3: 85 and 83
Option 4: 48 and 65
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Correct Answer: 48 and 65
Solution :
There are 5 centers in total, namely –
83 (Highlight with red), 65 (Highlight with blue), 56 (Highlight with green), 85 (Highlight with pink), 48 (Highlight with purple)
The highlighted figure will be –
Let's check each option –
First option:
83 and 65
Serial number of students for center 83 – 4381 / 6542 / 6989 / 2684 / 1264 / 6889
Serial number of students for center 65 – 3831 / 0183 / 2290 / 7596 / 6899 / 2920 ( None of the serial numbers are common for both the centers)
Second option:
56 and 65
Serial number of students for center 56 – 2068 / 7956 / 2639 / 1096 / 2109
Serial number of students for center 65 – 3831 / 0183 / 2290 / 7596 / 6899 / 2920 ( None of the serial numbers are common for both the centers)
Third option:
85 and 83
Serial number of students for center 85 – 5493 / 4350 / 2096 / 4593 / 0960
Serial number of students for center 83 – 4381 / 6542 / 6989 / 2684 / 1264 / 6889
Fourth option:
48 and 65
Serial number of students for center 48 – 2290 / 6802
Serial number of students for center 65 – 3831 / 0183 / 2290 / 7596 / 6899 / 2920 ( Here, 2290 is common for both the centers)
Hence, the fourth option is correct.
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