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HP HP-67 User Manual

HP HP-67
364 pages
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88
Function
Keys
Example:
In
an
electrical
circuit,
four
resistors
are
connected
in
parallel.
Their
values
are
220
ohms,
560 ohms,
1.2
kilohms,
and
5
kilohms.
What
is
the
total
resistance
of
the
circuit?
1
RT
=
1
+
1
+
1
+
1
R, R,
Ry R,
_
1
1 1
1
1
+ +
+
220 560
1200
5000
Press
Display
22009
4.545454545-03
560
03
1.785714286-03
0.01
1200
@
oot
5000
[0.01
Sum
of
reciprocals.
Q
m
The
reciprocal
of
the
sum
of
the
reciprocals
yields
the
answer
in
ohms.
Factorials
The
(N
(factorial)
key
permits
you
to
handle
permutations
and
combinations
with
ease.
To
calculate
the
factorial
of
a
positive
integer
in
the
displayed
X-register,
press
03
(N!].
Example:
Calculate
the
number
of
ways
that
six
people
can
line
up
for
a
photograph.
Method:
P§
=
6!
=6
X5
X4
X3 X2
X1,
Press
Display
6
o
N
720.00
The
answer.
The
calculator
overflows
for
factorials
of
numbers
greater
than
69.

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HP HP-67 Specifications

General IconGeneral
BrandHP
ModelHP-67
CategoryCalculator
LanguageEnglish

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