How many different three digit numbers can I make on an abacus with 25 beads and I have to use all of them?
It is for my nine year olds homework and he doesn't believe his dad has it right!
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February 23rd, 2010 at 10:57 am
using all the 25 beads each time only 6 three digit numbers can be made there. viz 799, 889, 898, 979, 988, 997.