Q1.Test the validity of each argument:

(a)If it rains, Erik will be sick.

It did not rain.

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Erik was not sick.

(b)If it rains, Erik will be sick.

Erik was not sick.

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It did not rain.

(c)If I study, then I will not fail mathematics.

If I do not play basketball, then I will study.

But I failed mathematics.

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Therefore I must have played basketball.