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Mathematics 7 Online
OpenStudy (anonymous):

help!!!

OpenStudy (anonymous):

\[S=n/2[2a+(n-1)d]\]

OpenStudy (anonymous):

make a as the subject of the formula

OpenStudy (cggurumanjunath):

try.

OpenStudy (cggurumanjunath):

|dw:1389527936143:dw|

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