3,5,-5,…
The first term in the sequence of numbers shown above is 3.Each even-numbered term is 2 more than the previous term and each odd-numbered term,after the first,is -1 times the previous term.For example,the second term is 3+2,and the third term is (-1)*5.What is the 55th term of the sequence?
A.-5 B.-3 C.-1 D.3 E.5
这道题目我不是很看得懂.额.Each even-numbered term is 2 more than the previous term这句
这题来自SAT OG P398 Q13