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how to calculate mode if two classes have same and highest frequency (bimodal) ?

If there are more than one class intervals which have the same frequency (equally qualifying to be the mode class) then both of the classes will be the mode class. this is called bimodal. 
However to calculate the mode of grouped data use the following formula
Mode = L + [ (F - F1) / { (F - F1) + (F - F2) } ] * h
where
L = Lower limit of the modal class 
F = Frequency of the modal class 
F1 = Frequency of the class immediately previous of modal class 
F2 = Frequency of the class immediate next of modal class 
h = Range of the modal class (higher limit - lower limit)

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check the question it's not possible, i suppose

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I don't think such questions will appear in the examination, as it is not included in our syllabus.

I searched the internet about this, and the best answer that I could find, is that t

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I don't think such questions will appear in the examination, as it is not included in our syllabus.

I searched the internet about this, and the best answer that I could find, is that there cannot be a mode if two classes have the same highest frequency. It is the same if there frequencies of some classes are 4,7,2,11,11,9,6. The two observations with 11 frequency would be the mode but there cannot be two modes, hence there is no mode for such an observation.

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