99 percent people don't solve | 1*2= 4 , 2*3=36, 3*4=?

99 percent people don't solve it | 1*2= 4 , 2*3=36, 3*4=?

[mingyeechik]

1^2+2^2 = 4
2^2+3^2 = 36
3^2+4^2 = 144