The seventh term of an A.P. is 15 and the sum of the first seven terms is 42. Find the first term and common difference.
How do I find the first term and common difference with only 1 term given?
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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