A meter bridge setup is shown in the figure. It is used to determine an unknown resistance \( R \) using a given resistor of \( 15 \, \Omega \). The galvanometer (\( G \)) shows null deflection when tapping key is at \( 43 \, \text{cm} \) mark from end A. If the end correction for end A is \( 2 \, \text{cm} \), then the determined value of \( R \) will be ________ \( \Omega \).
