Implications/Earthworms and children/Exercise

The following facts are known.

1. The earthworms are glad if and only if it rains or snows.
2. The children are glad if and only if the sun is shining or it snows.

What conclusion can we draw in each of the following cases.

a) The children and the earthworms are glad.

b) The children are glad and the earthworms are not glad.

c) The children are not glad and the earthworms are glad.

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