document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1132815>Question 1132815</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Rustam likes multiples of 5. For his RSM project he makes up numbers such that any two of the digits of any of his numbers, when put next to each other in some order, make a two-digit multiple of 5. His teacher calls such numbers Rustam’s numbers. For example, the numbers 51 and 502 are Rustam’s numbers, but the numbers 300 and 2018 are not. How many different three-digit Rustam’s numbers with none of the digits greater than 5 are there?<BR>\n" );
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document.write( "The problem sounds as if it might be interesting; but the statement of the problem is not clear.<br><BR>\n" );
document.write( "You say 300 and 2018 are not Rustam's numbers; but 30 is a 2-digit multiple of 5, and 10, 20, and 80 are all 2-digit multiples of 5.<br><BR>\n" );
document.write( "There is no point in our trying to count the number of Rustam's numbers if we don't have a clear definition of what they are. </SPAN>\n" );
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