The sequence you've provided is: 19, 15, 11, 7, 3.
To represent this sequence using subscript notation, we observe the pattern in the terms. The first term can be denoted as \( a_1 = 19 \), the second as \( a_2 = 15 \), the third as \( a_3 = 11 \), the fourth as \( a_4 = 7 \), and the fifth as \( a_5 = 3 \).
We can notice that the sequence decreases by 4 with each successive term:
- \( a_2 = a_1 - 4 \)
- \( a_3 = a_2 - 4 \)
- \( a_4 = a_3 - 4 \)
- \( a_5 = a_4 - 4 \)
We can describe this pattern with a general formula for the \( n \)-th term of the sequence:
\[ a_n = 19 - 4(n - 1) \]
This simplifies to:
\[ a_n = 23 - 4n \]
Thus, the subscript notation for the sequence is given by \( a_n = 23 - 4n \).
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