1953 AHSME Problems/Problem 35

Problem

If $f(x)=\frac{x(x-1)}{2}$ , then $f(x+2)$ equals:

$\textbf{(A)}\ f(x)+f(2) \qquad \textbf{(B)}\ (x+2)f(x) \qquad \textbf{(C)}\ x(x+2)f(x) \qquad \textbf{(D)}\ \frac{xf(x)}{x+2}\\ \textbf{(E)}\ \frac{(x+2)f(x+1)}{x}$

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1953 AHSME Problems/Problem 35

Problem

Solution