JBMO-SL 2011 C3
- Answer
We can change a natural number in three ways:
a) If the number has at least two digits, we erase the last digit and we subtract that digit from the remaining number (for example, from 123 we get );
b) If the last digit is different from 0 , we can change the order of the digits in the opposite one (for example, from 123 we get 321 );
c) We can multiply the number by a number from the set .
Can we get the number 21062011 from the number 1012011?
Dataset text NuminaMath olympiads. Quoted with source.
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NO
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