# Recurrences, let's start with easier

**Discrete Mathematics**Level 3

\[ \large \mathrm{ a_n= 7a_{n-1}- 6 a_{n-2}}\]

A recurrence relation satisfy the equation above with \(a_0 = 0, a_1=1 \).

Find the last 3 digits of \(a_{20} \).

\[ \large \mathrm{ a_n= 7a_{n-1}- 6 a_{n-2}}\]

A recurrence relation satisfy the equation above with \(a_0 = 0, a_1=1 \).

Find the last 3 digits of \(a_{20} \).

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