Question

Whats the answer ???
{MENTAL APTITUDE}

Answer 1

10...

As the first diagonal is 4... Then if we add the second diagonal, the sum is

 3 + 2 = 5... Sum of next diagonal is 3 + 1 + 2 = 6...Sum of next diagonal is 2 + 2 + 1 + 2 = 7...Sum of next diagonal is 3 + 1 + 4 = 8...Sum of next diagonal is 4 + 5 = 9...They all are following an order like 4,5,6,7,8,9 and thus, the question mark should be 10...