An AP consists of 37 terms. the sum of the three middle most terms is 225.and the sum of the last three terms is 429. find the AP
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a-d+a+a+d=225
3a=225
a=75------------------------1
sum of last 3
a+18d+a+17d+a+16d=429
a+17d=143-------------------------------2
1 and 2
75+17d=143
d=4
1st term
a-18d=75-18(4)=3
ap = 3,7,11,14......
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