The modal is the most common number. For example, if you had, 2,1,3, 4,4,3,2,2,1, the modal would be 2, since there is 3 2s
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These two are both similar because they are both expressions.
Equations are made from expressions.
Lcd/lcm
The radical must be identical like the expression must be identical. 2x^2+3x^2=5x^2 notice the power and bases are the same.
They are elements of of a set which may consist of integers, real or complex numbers, polynomial expressions, matrices.