Direction: In the following questions some 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 errors, then your answer is (4) i.e. No error.
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Solve the question according to given instruction
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- He is good
- in mathematics
- but his friend isn’t.
- No error
Correct Option: B
at will replace in because –
at (Prep.) is used with Adjectives to show how well somebody does something.
Look at the examples given below : 
