Given a positive number n, return true if n is a multiple of 9 and false if not. Do not make the division and do not use functions like mod or rem.
See Problem 42411 by Grant III
@Jean-Marie Sainthillier: You are right, sorry for not have checked before.
And thank you for the info, the problem-series by Grant III is very useful.
Back and Forth Rows
Find common elements in matrix rows
Arrange vector in ascending order
Largest Prime Number
Sum of series I
prime to each other
Number of occurrences of letter in a text
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