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If \( t_{r} \) denotes the \( r \) th term of an A.P., and \( t_{p}=1 / q \), \( t_{q}=1 / p \), then which of the following is a root of the equation \( (p+2 q+3 r) x^{2}+(q+2 r-3 p) x+(r+2 p-3 q)=0 \)
(a) \( t_{p} \)
(b) \( t_{q} \)
(c) \( t_{p q} \)
(d) \( t_{p+q} \)
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