- #1
psyclone
- 17
- 0
Homework Statement
Hi All,
I found this problem,
The sum of p, q, r terms of an Arithmetic Progression, are P, Q, R respectively: show that[tex] \frac{P (q - r )}{p} + \frac{Q (r - p )}{q} + \frac{R (p - q)}{r} = 0 [/tex]
Homework Equations
3. The Attempt at a Solution [/B]
My thoughts on how to start the problem is;
if
[tex] S_{n} = \frac{a}{2} (n + (n-1)d ) [/tex]
then the sum of say 'p' terms, would be
[tex] P = S_{p} = \frac{a}{2} (p + (p-1)d ) [/tex]
Therefore;
[tex] Q = S_{q} = \frac{a}{2} (q + (q-1)d ) [/tex][tex] R = S_{r} = \frac{a}{2} (r + (r-1)d ) [/tex]
If I used the following series, to simplify a little, [tex] S_{n} = 1 + 2 + 3 ... + n, [/tex] then [tex] S_{n} = \frac{1}{2}n(n+1) [/tex]
But how to form the above equation, which combines all series, which includes all terms (i.e p q, r, P, Q & R)?