Gate CS-2015-1 Question Paper With Solutions

Q. 28 In the LU decomposition of the matrix

| 2  2 |
| 4  9 |

, if the diagonal elements of U are both 1, then the lower diagonal entry l₂₂ of L is

(A) 4

(B) 5

(C) 6

(D) 7

Answer: (B)

Explanation: