Question 1173734
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Some punctuation and some care in your typing is needed for us to know what the questions really are.<br>
18 terms of an AP having a sum of 549 tells us that the average of the 18 terms is 549/18 = 30.5.  That would be useful in solving certain question about the AP; however, I don't now what to make of "find the 56terms and also the sum of 32term".<br>
Note that we can't get numerical answers for anything about the sequence without knowing the common difference; given only that the common difference is c, any expression for a particular term of the sequence, or for the sum of a certain number of terms of the sequence, will involve c.<br>
Re-post, making it clear what the questions are that are supposed to be answered.<br>