The question "How many terms are there in AP 17 25?" is incomplete. It seems to refer to the arithmetic progression (AP) 9, 17, 25,... and asks how many terms are needed for the sum to be 636.
Based on the reference, we can rephrase the question as: "How many terms of the arithmetic progression 9, 17, 25,... must be taken to give a sum of 636?". The answer to this question, as derived from the reference information, is 12.
Answer: 12 terms
