My question is:there is an arithmetic sequence that start from 2x-3 ,and followed by 2x-5,2x-7 and so on, so the diffrence between two terms is -2, and finally what is the product of the terms when reaching the (x-1)th term, in term of x.

My classmate ask me this question.I try to surf the internet but cannot understand or have few resources. Please help me to do this as elementary as possible (step by step) so I can more easily understand. Thanks.