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9 thoughts on “ S.N.1, S.N.2 - DFour Me* - Conversión (CDr) ”

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2. Jun 07,  · n = (-1 +- sqrt(1+8S))/(2) S = (n(n+1))/2 S = (n^2+n)/2 2S = n^2 +n n^2 + n - 2S = 0 using the quadratic formula for: ax^2 + bx + c = 0, n = (-b +- sqrt(b^2 - 4ac.

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3. Aug 07,  · S = n/2 [2a(n-1)d] a =, needed. If you look at the equation you see that a is trapped in [ ] brackets locked in by multiplication with a 2, an (n-1) and d; so if we isolate the [ ] brackets we can get in and isolate a by reversing the multiplication and dividing. Let's try this strategy.

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