a class of 50 students is+are in the class

A class of 50 students IS in the class.

The answer is "is"​ because a class of 50 students is a collective noun. Always in a collective noun a singular verb is used.
 
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The answer is ''is'' in this sentence
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Answer : IS beacuse it is talking about 'A Class ' means 1 class. We are not taking 'students' because it is second subject and a class is first subject that's why we are taking a class as subject
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