The equivalence resistance of resistors connected in series is given by the sum of the resistance of individual resistors.
For example, if three resistors say, Q, R and S are in series, then their resistance is given by,
[tex]R_{eq}=Q+R+S[/tex]If we add another resistance, say, T in series with these resistors, then the equivalence resistance will be,
[tex]R_{eq}=Q+R+S+T[/tex]This adding another resistor in series with a circuit increases the equivalent resistance.
Thus the correct answer is option 1.
