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OpenStudy (anonymous):
Find the indicated sum. 4 E k=1 (-1)k(k+1), A.2, B.54, C.46, D.-54
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OpenStudy (anonymous):
PLLLLLLZZZZZZZZ Help this is not a easy question for me i cant fail this test
OpenStudy (anonymous):
k = -k^2-k k =0 or k =2
OpenStudy (anonymous):
Thats all that i have to do im not good with this math
OpenStudy (anonymous):
No one is maths is a dark and scray world
OpenStudy (anonymous):
So thats all that i would have to do
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OpenStudy (anonymous):
yes expand and solve :)
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