18
3
1
+
=
=
(
Ans
x
2
)
1
=
Ans
Sequence of Numbers
One way of generating sequence of numbers is by using the key. Suppose we want to
generate a sequence with general term
)
1
(
3
2
+
n
, for
5
,
4
,
3
,
2
,
1
=
n
.
Procedure
1
. Make sure your calculator is in
COMP
mode. Then key in the following:
)
1
(
3
2
+
Ans
followed by
What do you see
? Our display screen is as shown on the right.
Your display screen may look different.
Why
?
2
. Now, press
followed by pressing the replay key
once to return to the previous screen as shown on right.
(
Remember, your display screen may look different!
)
3
. Press
once. We will get the display as shown on right.
4
. Continue on with
Then
and
Finally
Therefore, we have generated the following sequence of numbers: 6, 15, 30, 51, 78.
Try and design another way to generate the above sequence of numbers using your
fx
-
350MS.
3(Ans
2
+1)
678
3(Ans
2
+1)
678
3(Ans
2
+1)
6
2
=
=
3
=
=
4
=
=
5
=
=
3(Ans
2
+1)
15
3(Ans
2
+1)
30
3(Ans
2
+1)
51
3(Ans
2
+1)
78
Exploration and
Investigation
2
