Question

Find the 7th term of the sequence whose nth term is given by an=(-1)n-1 n3?

Answer 1

Answer :

Given that the n-th term of the sequence is

$a_n = (-1)^{n - 1} n^{3}$

Hence, the 7th term of the sequence be

$a_7 = (-1)^{7-1} \times 7^{3}$

= $(-1)^{6} \times 343$

= 343

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Answer 2

Answer:

The 7th term of the given sequence is 343

Step-by-step explanation:

Given that the nth term of the sequence is  :

$a_n = (-1)^{n - 1}\cdot n^{3}$

Hence, the 7th term of the sequence be :

$a_7 = (-1)^{7-1} \times 7^{3}\\\implies a_7= (-1)^{6} \times 343\\\bf\implies a_7= 343$

Hence, the 7th term of the given sequence is 343