Mathematics, 04.08.2021 21:00 lildanielmabien
In an AP, if the 12th term is -13 and sum of the first 4 terms is 24 then find the sum of its first 20 terms.
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In an AP, if the 12th term is -13 and sum of the first 4 terms is 24 then find the sum of its first...
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