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A safe has 5 locks, v, w, x, y and z ; all of which must be unlocked for the safe to open. The keys to the locks are distributed among five executives in the following manner :Mr. P has keys for locks v and x.Mr. Q has keys for locks v and y.Mr. R has keys for locks w and x.Mr. S has keys for locks x and z.Mr. T has keys for locks v and z.The minimum number of executives required to open the safe is _____3

Answer» A safe has 5 locks, v, w, x, y and z ; all of which must be unlocked for the safe to open. The keys to the locks are distributed among five executives in the following manner :



Mr. P has keys for locks v and x.

Mr. Q has keys for locks v and y.

Mr. R has keys for locks w and x.

Mr. S has keys for locks x and z.

Mr. T has keys for locks v and z.



The minimum number of executives required to open the safe is _____
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