The equivalent resistance is less than each of the resistances when they are connected in a [[1]] combination.

• In a parallel circuit, all components are connected across each other with exactly two electrically common nodes such that the electric current flowing through the circuit has multiple paths.
• Since there are more paths for the current to pass through the electric circuit, the equivalent resistance decreases and is less than all the resistances connected in parallel.
• For example, if two resistance of 150 Ω and 30 Ω are connected in parallel, then the equivalent resistance will be given by,
  $\frac{1}{{\mathrm{R}}_{\mathrm{eq}}}=\frac{1}{{\mathrm{R}}_1}+\frac{1}{{\mathrm{R}}_2}$
  $\frac{1}{{\mathrm{R}}_{\mathrm{eq}}}=\frac{1}{150}+\frac{1}{30}$
  $\frac{1}{{\mathrm{R}}_{\mathrm{eq}}}=\frac{180}{4500}$
  $\Rightarrow$R_eq = 25 Ω
  As we can see, the equivalent resistance is less than each of the resistance connected in parallel combination.

Hence 'Parallel' is the correct response.