Find Value of 3

[nycmathguy]

 

[MathLover1]

answer: 3=12

9*10=90
8*9=72
7*8=56
6*7=42
5*6=30
4*5=20
3*4=12

 

[nycmathguy]

answer: 3=12

9*10=90
8*9=72
7*8=56
6*7=42
5*6=30
4*5=20
3*4=12

Something other than precalculus for a change.