Question

If n(U) = 40, n(A) = 12, n(B) = 18 and n(A  B) = 20 then n(A  B), where U is the universal set, is​

Answer 1

Answer:

A chemical reaction is a process in which one or more substances, also called reactants, are converted to one or more different substances, known as products. ... A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products.