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-rw-r--r--doc/exercises.tex2
1 files changed, 1 insertions, 1 deletions
diff --git a/doc/exercises.tex b/doc/exercises.tex
index 3a9df19..9a18b99 100644
--- a/doc/exercises.tex
+++ b/doc/exercises.tex
@@ -596,7 +596,7 @@ ptest_llt(z_t n)
$M_n$ is composite if $n$ is composite, therefore,
if you do not expect prime-only values on $n$, the
-performance can be improve by using some other
+performance can be improved by using some other
primality test (or this same test if $n$ is a
Mersenne number) to first check that $n$ is prime.