Ā is proved for the sum of pth, qth and rth terms of an arithmetic progression are a, b,and c respectively.
and common difference=D
and
![=\frac{[Aq+pqD-Dq-Ar-prD+rD]\times qr+[Ar+rqD-Dr-Ap-pqD+pD]\times pr+[Ap+prD-Dp-Aq-qrD+qD]\times pq}{pqr}](/tpl/images/0428/8414/97df3.png)
Any 10th grader solve it
for 50 points
...
Answers: 3
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