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If $p-1$, $q-1$ and $r-1$ are in A.P., then :
- (a)$p-2$, $q$, $r-2$ are also in A.P.
- (b)$2p$, $3q$, $4r$ are also in A.P.
- (c)$\frac{p}{2}$, $\frac{q}{3}$, $\frac{r}{4}$ are also in A.P.
- (d)$2p$, $2q$, $2r$ are also in A.P.
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Ans. (D) $2p$, $2q$ and $2r$ are also in A.P.