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In an A.P. of which `a` is the first term if the sum of the first `p` terms is zero, then the sum of the next `q` terms is a. `(a(p+q)p)/(q+1)` b. `(a(p+q)p)/(p+1)` c. `-(a(p+q)q)/(p-1)` d. none of these

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