The capacitance of a portion of a circuit is to be reduced from 4800 pF to 2900 pF. What capacitance can be...?

The capacitance of a portion of a circuit is to be reduced from 4800 pF to 2900 pF. What capacitance can be added to the circuit to produce this effect without removing existing circuit elements? Must any existing connections be broken in the process?

please help me understand how such circuits work!
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