athematic progression

Asked by  | 22nd Dec, 2009, 02:45: PM

Expert Answer:

 p, q and 2p

a = p

a+d = q

d =q-p

a+(n-1)d =2p

d = p/(n-1)

q-p = p/(n-1)

so n = q/(q-p)

Sum to n terms = n/2 (first term+last term)=  2q/(q-p)(3p)

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Answered by  | 22nd Dec, 2009, 03:54: PM

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