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求解高人。。这题怎么做
gwd 1
Q28:
For any positive integer n, the sum of the first n positive integers equals [n(n+1)]/2.What is the sum of all the even integers between 99 and 301?
A.10,100
B.20,200
C.22,650
D.40,200
E.45,150
Answer: b |
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