Consider the following:1. Saxena,David,Jain,a | vedclass

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(C) Let the initial positions in $1970$ be: Saxena $(P)$,David $(Q)$,Jain $(R)$,Kumar $(S)$.Step $1$ $(1972)$: Saxena and Jain swap,Kumar and David sw

Vedclass · Accepted Answer

Interchange David and Kumar as well as Saxena and Jain.

Vedclass · Answer

(C) Let the initial positions in $1970$ be: Saxena $(P)$,David $(Q)$,Jain $(R)$,Kumar $(S)$.Step $1$ $(1972)$: Saxena and Jain swap,Kumar and David swap.Positions: Saxena $(R)$,David $(S)$,Jain $(P)$,Kumar $(Q)$.Step $2$ $(1973)$: David and Jain swap,Saxena and Kumar swap.Positions: Saxena $(Q)$,David $(P)$,Jain $(S)$,Kumar $(R)$.Let's track the history of each person:Saxena: $P \rightarrow R \rightarrow Q$David: $Q \rightarrow S \rightarrow P$Jain: $R \rightarrow P \rightarrow S$Kumar: $S \rightarrow Q \rightarrow R$To ensure everyone visits all four places,we need to assign the remaining place to each person:Saxena needs $S$.David needs $R$.Jain needs $Q$.Kumar needs $P$.Comparing current positions $(1973)$ with required positions:Saxena $(Q)$ $\rightarrow$ needs $S$.David $(P)$ $\rightarrow$ needs $R$.Jain $(S)$ $\rightarrow$ needs $Q$.Kumar $(R)$ $\rightarrow$ needs $P$.If we interchange Saxena $(Q)$ and Jain $(S)$,Saxena gets $S$ and Jain gets $Q$. If we interchange David $(P)$ and Kumar $(R)$,David gets $R$ and Kumar gets $P$. This satisfies the condition.

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