1.

If sum of (n+1) terms of an arithmetic sequence is pn^2+qn+r, prove that p+r=q

Answer»

Here N+1=0
n=-1
pn ^{2} + qn + <klux>R</klux>
Put the VALUE of n in above equation,

P(-1)^2 + Q(-1) + r = 0
p - q + r = 0
p + r = q


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