If x is equal to the sum of the even integers from m to n, inclusive, where m and n are positive even integers, which of the following represents the value of x in terms of m and n?
(A) (m+n/2 )(n-m/2 + 1)
(B) 3(m + n)
(C) n^2-m^2/2
(D) 6(m + n)
(E) (m+n/2 )(n-m/2 )
OA is A
(A) (m+n/2 )(n-m/2 + 1)
(B) 3(m + n)
(C) n^2-m^2/2
(D) 6(m + n)
(E) (m+n/2 )(n-m/2 )
OA is A
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