Question

what is the 9th term in the sequeces -1,4,-9,16,-25,..?
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Answer 1

In sequence 1st 3rd and 5h terms are following -(n)^2  ...odd terms

                    2nd and 4th term are following (n)^2.......even terms

As 9th is an odd term so it will be

                          = - 81

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