Please can someone solve this sum The sum of p terms of an A.P. is q and the sum of q terms is p.  Find the sum of p+q terms 

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Form a simultaneous equation by using the formula for sum of an AP: n/2(2a + (n-1)d) In this case: 1. q= p/2(2a +(p-1)d) 2. p= q/2(2a +(q-1)d)