In the arithmetic sequence t1, t2, t3, ..., tn, t1=23 and tn= tn-1 - 3 for each n > 1. What is the value of n when tn = 8?	Choose the correct choice from the following choices.
A) -1  B) 6  C) 10  D) 14  E) 20
We know that t1 = 23   So, using the given formula we have:   t1=(t1-1) -3 =23   t0 - 3 = 23   t0= 26   The same way we find that t2= 20   It seems that the sequence goes like this:   t0 = 26   t1 = 23   t2 = 20   t3 = 17   t4 = 14   t5 = 11   t6 = 8   So, ourANS is 6.
<result>B</result>
In the arithmetic sequence t1, t2, t3, ..., tn, t1=23 and tn= tn-1 - 3 for each n > 1. What is the value of n when tn = 8?