Question

ninth term of an ap an= (-1)^n-1 , n3 is ?

Answer 1

Step-by-step explanation:

As, nth term is given by a

n

=(−1)

n−1

.n

3

So, 7th term equals=a

7

=(−1)

7−1

.7

3

⟹a

7

=(−1)

6

.343

⟹a

7

=343

Answer 2

Answer:

Putting n = 9 in the given sequence an= (–1)n–1 n3, we get a9 = (–1)9–1 (9)3 = (9)3 = 729 Hence the 9th term is 729. Therefore the required term is 360/23.

Step-by-step explanation:

739