Final answer:
The value of x in the sequence is X.
Step-by-step explanation:
The question asks you to find the value of x in the given sequence: 16, 1, A, K, 9, C, X, case of sit, B. To solve this, we need to identify any patterns or clues in the sequence.
One possible pattern is that each element corresponds to the first letter of a word or number.
By following this pattern, we can find that the letter 'X' corresponds to the word 'case', so the value of x is X.