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Given :               a= Safe                b= Safe                c= Unsafe

But If  Fig. 6-11(b) , D asks for one more unit then  Need Table is

      A     5
      B     4
      C     2
      D     2

 

we have only one unit left which can not satisfied any one of the Above process.. ………………

therefore If D asks for one more unit, does this lead to an unsafe State .

 if the request came from C instead of D then it lead to a Safe state  check below Need table is

      A      5
      B      4
      C      1
      D      3

Which can be easly Satisfied and lead to a Safe state.

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