Direction: In the following questions some parts of the sentences have errors and some have none. Find out which part of a sentence has an error. The number of that part is your answer. If there is No error, then your answer is (4) i.e. No error.
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					 Solve the question according to given instruction
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                        - Unless you are careful,
- you are bound to make mistake
- in your work.
- No error.
 
Correct Option: B
make a mistake/make mistakes will replace make mistake. 
if we are talking about one mistake, we will use make a mistake 
if we are taking about more than one mistake we will use make mistakes 
Hence, you are bound to make a mistake/make mistakes is the right usage. 
 
	