The sum of the 1st n terms, of an AP is $S_n=n^2-3n$. Write down the 4th term and find an expression for the $n$th term.
Will the 4th term be $t_4= a+3d$?
I have injection $f \colon A \rightarrow B$ and I want to get bijection. Can I just resting codomain to $f(A)$? I know that every function i...
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