Let be a matrix satisfying
Then the sum of the diagonal entries of is
Then the sum of the diagonal entries of is
Answer: 9
Solution
Let .
From , we get .
From , we get:
From , we get:
The sum of diagonal entries is .
From , we get .
From , we get:
From , we get:
The sum of diagonal entries is .
JEE Advanced · 2011 · 10 Apr 2011 · Paper 2 · Integer answer