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$\sqrt{ \color{#FF6800}{ 15 } \color{#FF6800}{ \times } \color{#FF6800}{ 16 } \color{#FF6800}{ \times } \color{#FF6800}{ 17 } \color{#FF6800}{ \times } \color{#FF6800}{ 18 } + 1 }$

$ $ Multiply the numbers $ $

$\sqrt{ \color{#FF6800}{ 73440 } + 1 }$

$\sqrt{ \color{#FF6800}{ 73440 } \color{#FF6800}{ + } \color{#FF6800}{ 1 } }$

$ $ Add $ 73440 $ and $ 1$

$\sqrt{ \color{#FF6800}{ 73441 } }$

$\sqrt{ \color{#FF6800}{ 73441 } }$

$ $ Organize the part that can be taken out of the radical sign inside the square root symbol $ $

$\color{#FF6800}{ 271 }$