GATE Civil Engineering (CE) 2022 Shift 2 Solved Paper

The function f(x, y) satisfies the Laplace equation
${\nabla }^2\mathit{f}\left(\mathit{x},\mathit{y}\right)=0$
on a circular domain of radius r = 1 with its center at point P with coordinates x = 0, y = 0. The value of this function on the circular boundary of this domain is equal to 3.
The numerical value of f(0, 0) is: