HP HP-65 - Page 49

Functions 47
Sample
Case:
Reciprocals.
Calculate:
¥4
=.25.
Press See Displayed Comment
48 3 Reciprocal of 4.
Naturally, you can use this value in another calculation. For
example, to go on and calculate
1
ANV
V4 is already calculated. We need only
Press See Displayed Comment
Reciprocal of 4.
3@ 0.33 Reciprocal of 3.
= - Sum of reciprocals.
B [~ Answer: reciprocal of sum.
Sample Case: Factorial. Calculate the number of ways 6 people
can line up for a photograph.
Press See Displayed Comment
6 @ [ 720.00 Answer.
Sample Case: Exponential. In the preceding section we calculated
the successive terms of a geometric series to find that after 6
periods, $1000 invested at 10% grows to $1771.56. Using the
function, the same result'is obtained by evaluating the fol-
lowing:
1000 (1.10)°
Press See Displayed Comment
1000 [ENTER _ Original amount
& s (1.10)°
x _ Answer.