If you try to use an index that is greater than 0 or less than the index of the last position in the StringBuilder object, you cause an error known as an exception and your program terminates.

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An index greater than the last position or less than 0 in a StringBuilder object will cause an exception, but the statement incorrectly suggests that an index greater than 0 is problematic, which is not true.

If You Try to Use an Index That Is Greater