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Arrays - Programming

Q1:

Which of the following are the correct ways to define an array of 2 rows and 3 columns? 
  1. int[ , ] a;
a = new int[2, 3]{{7, 1, 3},{2, 9, 6}};
  2. int[ , ] a;
a = new int[2, 3]{};
  3. int[ , ] a = {{7, 1, 3}, {2, 9,6 }};
  4. int[ , ] a;
a = new int[1, 2];
  5. int[ , ] a;
a = new int[1, 2]{{7, 1, 3}, {2, 9, 6}};

A 1, 2 , 3

B 1, 3

C 2, 3

D 2, 4, 5

E 4, 5

ANS:B - 1, 3

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