the 14th term of an AP is twice its 8th term. if its 6th term is -8 then find the sum of its first 20 terms.
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ans is -340 plz tell me that em correct or not
n -d=a so plz put the value of d -(-2)=a so a= 2
n -d=a so plz put the value of d -(-2)=a so a= 2
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