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?
Seeing-eye dog
There's a guy with a Doberman Pinscher and a guy with a Chihuahua. The guy with the Doberman Pinscher says to the guy with a Chihuahua, "Let's go over to that restaurant and get something to eat."
The guy with the Chihuahua says, "We can't go in there. We've got dogs with us."
The guy with the Doberman Pinscher says, "Just follow my lead." They walk over to the restaurant, the guy with the Doberman Pinscher puts on a pair of dark glasses, and he starts to walk in.
A guy at the door says, "Sorry, mac, no pets allowed."
The guy with the Doberman Pinscher says, "You don't understand. This is my seeing-eye dog."
The guy at the door says, "A Doberman Pinscher?"
He says, "Yes, they're using them now, they're very good."
The guy at the door says, "Come on in."
The guy with the Chihuahua figures, "What the heck," so he puts on a pair of dark glasses and starts to walk in. The guy at the door says, "Sorry, pal, no pets allowed."
The guy with the Chihuahua says, "You don't understand. This is my seeing-eye dog."
The guy at the door says, "A Chihuahua?"
The guy with the Chihuahua says, "You mean they gave me a Chihuahua?"