When number of turns in a coil is trippled, without any change in the length of coil, its self inductance becomes?

When number of turns in a coil is trippled, without any change in the length of coil, its self inductance becomes? Correct Answer Nine times

L = inductance is proportional to the number of turns per unit length. So self inductance becomes three times. if turns in a coil is trippled, self inductance become nine times.
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