Sequencce (Xn) please?
See process below
Take a look to the first four terms
First: we note that terms are alternate positive and negative, so the ratio is a negative number. Lets see
Then the comon ratio is
a) The recurrence system is
By other hand, we know that a geometric sequence has the general term given by
d) However the common ratio is bigger than 1, when n increase his value, the terms grow indefinitely alternating sign (the even terms are negatives and odd positives)