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OpenStudy (anonymous):
Can anyone help me I need to solve this for d: S=n/2(2a+(n-1)d)
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OpenStudy (anonymous):
I can't figure it out sorry. I tried.
OpenStudy (anonymous):
S = n/2 [ 2a+(n-1)d ] 2S/n = 2a+(n-1)d 2S/n - 2a = (n-1)d => d = ( 2S/n) - 2a ) / ( n -1)
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