In the mini$-$max tree shown in the following figure choose the minimum possible positive integer values for x y and z$.$ If no solution, write impossible Tree $.$

what are the value of x$,$ y and z if no branches are pruning?

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What are the minimum possible positive integer values for x y and z if only one branch is pruned?

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What are the minimum possible positive integer values for x y and z if two branches are pruned?

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What are the minimum possible positive integer values for x y and z if three branches are pruned?