Hex digit after nine – UGC NET Question

In hexadecimal, the sequence of symbols extends beyond 9 by using letters. After the digit '9', the next symbol is 'A', followed by 'B', 'C', 'D', 'E' and 'F'. This allows representation of values 10 to 15. Therefore, the digit that comes immediately after '9' is 'A'.

Option A:
Option A shows "10", which is interpreted as a two-character string rather than a single hex digit. In hexadecimal, 10 usually represents sixteen in decimal, not the next digit after 9. Hence it is not correct as a single digit successor.

Option B:
Option B gives 'B', which is indeed a hexadecimal digit but it follows 'A' in the sequence. The order goes 9, then A, then B. So 'B' is not immediately after '9'.

Option C:
Option C repeats '9', which is the current digit and not the next one. It does not move forward in the hexadecimal ordering. Thus it cannot answer the question that asks for the immediate successor.

Option D:
Option D is correct because in the hexadecimal digit order, 'A' is the symbol that comes right after '9'. It starts the series of letter-based digits representing values from 10 onwards.