diff --git a/docs/tutorials/probabilistic-error-amplification.ipynb b/docs/tutorials/probabilistic-error-amplification.ipynb
index fe0bf650591..3fb3ad505ba 100644
--- a/docs/tutorials/probabilistic-error-amplification.ipynb
+++ b/docs/tutorials/probabilistic-error-amplification.ipynb
@@ -47,7 +47,7 @@
     "It assumes expectation values scale with noise by a known function\n",
     "\n",
     "$$\n",
-    "\\langle A(\\lambda) \\rangle = \\langle A(0) \\rangle =+ \\sum_{k=0}^{m} a_k \\lambda^k + R\n",
+    "\\langle A(\\lambda) \\rangle = \\langle A(0) \\rangle + \\sum_{k=0}^{m} a_k \\lambda^k + R\n",
     "$$\n",
     "where $\\lambda$ parameterizes the noise strength and can be amplified."
    ]