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I think it will also no work for n = 2 .
Because you have not reset the variable value answer = 0 inside for loop of (i).
As a result for n = 2, i condition satisfies , j contition satisfies (Twice), for i = 2 , j = 0 answer = 1 + 3 which is equal to 4.
which is supposed to be equal to 3. please see and check you code once again.