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Verified answer
Solution
Let us consider the first term and common difference of the AP be a and d respectively
Given ,
And
Subtracting (1) from (2)
Now putting the value of ‘d’ in (1)
Thus ,
first term , a = 1/pq
common difference , d = 1/pq
Thus , sum upto pq terms is :
Where p≠q (proved)