there are 37 terms in an AP the sum of 3 terms placed exactly at the middle is 225 and the sum of the last 3 terms is 429 write the AP
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the middle terms will be 18 19 20
a+17d+a+18d+a+19d=225
3a+54d=225
last 3 terms are 35 36 37
a+34d+a+35d+a+36d=429
3a+105d=429
find a and d solving the equations
a+17d+a+18d+a+19d=225
3a+54d=225
last 3 terms are 35 36 37
a+34d+a+35d+a+36d=429
3a+105d=429
find a and d solving the equations
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