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April 19, 2015

April 19, 2015

Posted by **noor** on Tuesday, February 28, 2012 at 10:53am.

- maths -
**Steve**, Tuesday, February 28, 2012 at 12:03pmT7 = a+6d

T11 = a+10d

T27 = a+26d

a+6d = 0

a = -6d

T27 = -6d+26d = 20d

T11 = -6d+10d = 4d

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