Find the indicated term(s) in each of the following sequences whose nth terms are:
(i) an = (-1)n-1 n3; a9,
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Answer:
t
2
=
(2)
2
t
2−1
=
4
t
1
=
4
3
[given: t
1
=3]
And
t
3
=
(3)
2
t
3−1
=
9
t
2
=
9
4
3
=
4×9
3
=
12
1
[∵t
2
=
4
3
]
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