Answer:
Explanation:
(1) Using the rule

put n=8 in the above formula we get

Hence,

(2) The given sequence has common difference -2.5
common difference that is

We will use the formula of AP which is

Here, a= 13, d=-2.5 and n=n on substituting the values in the formula we get


Hence, Option A
(3)From the given information we can conclude

We have to find

On substituting the values we get


coins the coin collector will have.
(4) Recursive rule for
will be
Put n=1 in the given formula we get

When n=2 we get

When n=3 we get

Hence, option A that is
