1970 AHSME Problems/Problem 22

Problem

If the sum of the first $3n$ positive integers is $150$ more than the sum of the first $n$ positive integers, then the sum of the first $4n$ positive integers is

$\text{(A) } 300\quad \text{(B) } 350\quad \text{(C) } 400\quad \text{(D) } 450\quad \text{(E) } 600$

Solution

$\fbox{A}$

1970 AHSC (Problems • Answer Key • Resources)
Preceded by Problem 21	Followed by Problem 23
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1970 AHSME Problems/Problem 22

Problem

Solution

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