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
–
(
)
!
------------------
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