2. Write the first four terms of the sequence whose nth term is given by (-1^n)×sin (nπ/2)
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1
Answer:
Given that: T
n
=
n+1
n
2
Then T
1
=
1+1
1
2
=
2
1
,
T
2
=
2+1
2
2
=
3
4
,
T
3
=
3+1
3
2
=
4
9
,
T
4
=
4+1
4
2
=
5
16
∴ The first four terms of the sequence are
2
1
,
3
4
,
4
9
,
5
16
.
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