Geeta use to sale rangoli and earns some money during diwali vacation ​

In the following questions, some parts of the sentences have errors and some are correct. Find out which part of a sentence has an error. The number of that part is your answer. If a sentence is free from error, then your answer is (4) 1.e. No error. The teacher, as well as the students, (1) have gone on an excursion (2)/ to Oooty during their summer vacation. (3)/No Error. (4)