Suppose that a certain atom possesses only four distinct energy levels. Assuming that all transitions between levels are possible, how many spectral lines will this atom exhibit? 
Definitions:
Effective Yield
The total yield, or return, on an investment that takes into account the effect of compounding interest, as opposed to just the nominal rate.
Present Value Factors
A multiplier used to calculate the present value of a future payment or series of payments, reflecting the time value of money.
Present Value Factors
A set of coefficients used to calculate the present value of a future cash flow, considering a specific discount rate.
Effective Yield
A measure of the return on investment, taking into account the effect of compounding interest, unlike the nominal interest rate.
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