Texas Instruments MathPrint TI-30X Plus Quick Guide

12
Example
All people attending a party shook hands with each other as a way of exchanging a greeting.
The number of handshakes,
N
, exchanged between
x
people at the party is given by
( ) ( )
1
2
x
N x x=−
where
x
+

.
(a) Use the TI-30X Plus MathPrint™ function feature to find the number of handshakes
that would be exchanged between
5,10
and
50
people respectively.
(b) Given that
136
handshakes were exchanged, use the TI-30X Plus MathPrint™
function feature to determine how many people at the party shook hands.
Keystrokes and solution:
(a)
Press a 1 to access the function table.
[If required, press .]
Press k and press z to paste
x
.
Press ] and enter
2
.
Press > * ( z - and enter
1
.
Press  ] ].
Move the cursor to highlight
?x=
and
press n (CALC) n.
Enter
5
and press n.
Enter
10
and press n.
Enter
50
and press n.
With
5
people, there are
10
handshakes.
With
10
people, there are
45
handshakes.
With
50
people, there are
1225
handshakes.
Alternatively, press q – to go to the
home screen.
Press a 2 and enter
5
.
Press ) n. So
( )
f5
is
10
.
Press [ to go up and highlight
( )
f5
.
Press n.

Texas Instruments MathPrint TI-30X Plus Specifications

General

Brand	Texas Instruments
Model	MathPrint TI-30X Plus
Category	Calculator
Language	English