HP 30b - Business Professional Calculator - Binomial Functions; Two-Number Functions

Mathematical Calculations
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Binomial Functions
The binomial function calculates the probability of having up to k successes out of n throws,
when the probability of success is p. Enter n and p each followed by = and type k and
navigate to the binomial function in the math menu.
Two-Number Functions
Apart from +-*/, the three additional two-number functions accessible on
the keyboard are:
•y
x
•nCr
•nPr
y
x
is the power function, nCr stands for the number of combinations of n items taken r at a
time, and nPr stands for the number of permutations of n items taken r at a time.
Combination=
Permutation=
Perform calculations with these functions in the same way you would perform calculations with
+-/ and *, but press : to access the secondary function key. For
example, to calculate 15
3
:
1. P r e s s 15.
2. Press :h.
3. Press 3=. The result is shown in Figure 9.
Figure 9
In RPN mode, key in the numbers first, followed by I, then press the function key. For
example, for the power function example above, in RPN press:
15I3:h.
n!
r! nr–()!
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n!
nr–()!
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