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Upon receiving his student's card, Danny stated that he will never
forget its 5-digit number:
"It has only three distinct digits - one pair of equal digits followed by a pair of two other equal digits and the product of the second pair in the end.
Sum of the digits is over 30."

Is the above a sufficient mnemonic aid?

(No Solution Yet, 1 Comments) Submitted on 2018-01-20 by Ady TZIDON    

Difficulty: 2 of 5 Quite a coincidence (in Just Math) Rating: 3.00
"It's unbelievable!" exclaimed Jerry facing his three friends Adam, Dan and Betty.
"I've asked you to tell me independently each a 4-digit number and after a while, I'm happy to announce that if any of you will divide their number by mine you will end up with the same remainder! "
Now that you know it I'm sure that you will be able jointly to figure the value of my number...- of course it will be the largest of the qualifying candidate answers...

Adam: It could not be true for any three non-related 4-digit numbers!
Betty: You were extremely lucky to find such a special number!
Dan: And now we will be able to calculate the value of your number!

Indeed, Adam(2479), Betty(6181), and Dan(8649), after a not-so-long brainstorming session successfully restored Jerry's number.

a. What was it?
b. d4 bonus question:
What's the probability of Jerry "success" with 3 RANDOMLY CHOSEN
three 4-digits numbers.
Provide your estimate, listing your assumptions and reasoning.

(No Solution Yet, 6 Comments) Submitted on 2018-01-19 by Ady TZIDON    

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