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# There are four three-digit n...

There are four three-digit numbers that share this property: the number itself, its double and its triple contain each digit from 1 to 9 exactly once. For example, 192 is one of them because 192, 384, 576 contain 1 to 9 each once. 273 is another one of them because 273, 546, 819 contain 1 to 9 each once. Can you find the other two numbers and calculate the product of these two numbers?
The first user who solved this task is Djordje Timotijevic.
#brainteasers #math #riddles

### The magician and the parrot...

A magician was working on a cruise ship in the Caribbean. The audience would be different each week, so the magician allowed himself to do the same tricks over and over again.

There was only one problem: The captain's parrot saw the shows every week and began to understand what the magician did in every trick. Once he understood that, he started shouting in the middle of the show.

"Look, it's not the same hat!" "Look, he's hiding the flowers under the table!" "Hey, why are all the cards the Ace of Spades?"

The magician was furious but couldn't do anything, it was the captain's parrot after all.

One day the ship had an accident and sank. The magician found himself on a piece of wood, in the middle of the ocean, and of course the parrot was by his side.

They stared at each other with hate, but did not utter a word. This went on for several days.

After a week the parrot finally said, "Okay, I give up. What'd you do with the boat?"

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### Herbert Spencer Jennings

Died 14 Apr 1947 at age 79 (born 8 Apr 1868). American zoologist who was one of the first scientists to study the behaviour of individual microorganisms and to experiment with genetic variations in single-celled organisms. He wrote his Ph.D. thesis on the morphogenesis of rotiferans (microscopic aquatic organisms), an area of scientific interest he pursued for the next 10 years. The peak of his research and his primary contribution to zoology was his Behaviour of the Lower Organisms (1906). In this study of the reactions of individual organisms and individual response to stimuli, Jennings reported new experimental evidence of the similarity of activity and reactivity in all animals, from protozoans to man. For 40 years of his career Jennings studied the mechanisms of inheritance and variation in single-celled organisms.
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