2nd term is 5, 5th term is 2. The common difference is -1.Find 1st term,3rd term, and 4th term. Tell me the formula of finding ot

2nd term is 5, 5th term is 2. The common difference is -1.Find 1st term,3rd term, and 4th term. Tell me the formula of finding other terms .Give an explanation.
Anybody knows the answer?​

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