Write the following as intervals: 

(i) {x: x ∈ R, –4 < x ≤ 6} 

(ii) {x: x ∈ R, –12 < x < –10} 

(iii) {x: x ∈ R, 0 ≤ x < 7} 

(iv) {x: x ∈ R, 3 ≤ x ≤ 4} 

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• Consider the following code fragment
  void foo(int x, int y)
  {
  x+=y;
  y+=x;
  }
  main()
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  int x=5.5;
  foo(x,x);
  }
  What is the final value of x in both call by value and call by reference, respectively?
  (A) 5 and 16
  (B) 5 and 12
  (C) 5 and 20
  (D) 12 and 20
  
  

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• Ionisation energy in group 1A varies in the decreasing order as 

  (a) Li > Na > K > Cs 

  (b) Na > Li > K >Cs 

  (c) Li > Cs > K > Na 

  (d) K > Cs > Na > Li

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  (B) non-key and non-ordering
  (C) key and ordering
  (D) key and non-ordering
  
  

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• What is the number of steps required to derive the string ((() ()) ())

  S → SSS → (S)S → ε

  (A) 10
  (B) 15
  (C) 12
  (D) 16
  
  

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