mark lee answered 1/12/2011 The Fact Families 2x3=6 And 2x10=20 Contain Exactly 3 Different Digits. How Many Other Fact Families With Dividends Under 100 Contain Exactly 3 Different Digits? Dividends under 100, so you should consider 2*11=22...... 2*48=96. So isn't it 131 (Well -2 so 129)?This is hard....
