Solution

The correct answer is option 4.

Concept:

The given java program that takes an integer value and returns a string value :

public static String F(int N)

{

if ( N <= 0) return "-";

return F(N - 3) + N + F(N - 2) + N;

}

The value of F(5) is :

it calls a return statement sub-functions  F(2) + 5 + F(3) + 5;

Hence the correct answer is -2-25-3-1-135.