1. Mathematics is my favourite subject.

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1. Mathematics is my favourite subject.

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one of the boys look happy

i hope it's useful to u and pls mark as a brainliest

(There is a 's' in Mathematics but this does not make it plural.It is considered to be singular as it is a particular subject.

Other examples of such words are :Physics, Politics etc.)

2. One of the boys look happy.

(we do not consider 'boys' to choose between 'look' and 'looks' instead we consider 'one of the'.)