If we let x denote the sum of the integers from 1 to 25, ...

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PS · Problem Solving

505-555

Arithmetic

If we let x denote the sum of the integers from 1 to 25, and let y denote the sum of the integers from 26 to 50, what is the result of y – x?

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A

25

B

75

C

325

D

425

E

625

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Explanation

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