HP 30b HP 20b Business Consultant and HP 30b Business Professional User's Guid - Page 31

Binomial Functions, Two-Number Functions, stands for the number of permutations

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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: • yx • nCr • nPr yx 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= r---!--(---n-n----!-----r--)--!- Permutation= (---n----n----!--r---)--! 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 153 : 1. Press 15. :h 2. Press . 3= 3. Press . The result is shown in Figure 9. Figure 9 I In RPN mode, key in the numbers first, followed by , then press the function key. For example, for the power function example above, in RPN press: 15I3:h. Mathematical Calculations 23

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Mathematical Calculations
23
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.
Press
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
!
n
r
–
(
)
!
----------------------
n
!
n
r
–
(
)
!
-----------------