An A.P. consists of 37 terms. The sum of the three middlemost terms is 225 and the sum of the last three terms is 429. Find the A.P. and the sum of all the 37 terms.
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in 38 terms of AP we find that 19th term and middle term and 18 and 19 and 20 terms are the three middle most terms let a be the first term and the common difference of the AP
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