Question

Find the value of a5 if an is (-1)n-1

(2)n+1
​

Answer 1

Answer:

-1 is a correct ans........

Answer 2

Answer:

an is (-1)n-1+(2)n+1

If it is your question

then answer is

4

Because substitute

5 in the place of n if you missed and symbols like +&- in b/w the terms