180 // Strictly Logical

impression. `Each of you has given one correct answer and two wrong ones.'

What day is it today?

...........................................

Answer on page 288

Strictly Logical Only an elephant or a whale gives birth to a creature that weighs more than 100 kilograms.

The President weighs 150 kilograms.

Therefore . . .

(I learned this one from the writer and publisher Stefan

........................................... Themerson.)

Logical or Not?

If pigs had wings, they'd fly.

Pigs don't fly if the weather is bad.

If pigs had wings, the sensible person would carry an

umbrella.

Therefore:

If the weather is bad, the sensible person would carry an

umbrella.

Is the deduction logically valid?

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Answer on page 288

A Question of Breeding Farmer Hogswill went to the village fete, where he met five of his friends: Percy Catt, Dougal Dogge, Benjamin Hamster, Porky Pigge and Zoe Zebra. By a remarkable coincidence ­ which was a constant source of amusement ­ each of them was an expert

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