The schedule of which of the following subjects can be uniquely determined?

English

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Biology

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Economics

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none of these

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Solution

The correct option is B
Biology

There can be two cases for the scheduled day of exams, since on every unique day of the week, there is atleast one exam:

Case I:MonTueThurSatMonWedFri

This is not possible as exams end on Saturday.

$\begin{matrix} C a s e I I & M o n & W e d & F r i & S a t & T u e & T h u r s & S a t P h y & C h e m & C o m p & B i o & M a t h & E c o & E n g O r & C h e m & C o m p & P h y / M a t h & B i o & E n g & E c o & M a t h / P h y O r & E n g & E c o n & M a t h & B i o & C h e m & C o m p & P h y O r & P h y / M a t h & E c o & E n g & B i o & M a t h / P h y & C h e m & C o m p \end{matrix}$

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