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?

36 is the total number of fact families with three different digits and a dividend less than 100. However, the question asks "how many other fact families", so you have to subtract out the two given in the question. 36-2=34

Last part of the question relates to the first two examples so the answers would be 3x2=6 and 10x2=20

2*3=6 2*4=8 2*5=10 2*6=12 2*7=14 2*8=16 2*9=18 2*10=20 3*4,3*5, 3*6, 3*7,3*8,3*9,3*10,4*5,...4*10 if you notice for 2-table, 8, and for 3-table its 7, and for4-table its 6.. So 8+7+6+5+4+3+2+1, here 10-table can be easily excluded, hence the answer is 36