That refers to terms that have exactly the same combination of variables. For example, in 5xy + x2 - 3xy, the first and last term have the same variables, so they are similar. You can simplify an expression by combining such terms.
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Symmetry
The Maths terms combination and permutation apply in chemistry when making the expected industrial calculation.
1st
A gross is 144.
A score is equal to 20.