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If first term of AP is 5. 16th term is 45.find the sum of first 16 terms?
Answer:
1st term=5 16th term=45 ; 5+15d=45 where d is common difference. d=8/3.
therefore sum of 1st 16 terms= 16/2(2*5 + 15*8/3)=400
therefore sum of 1st 16 terms= 16/2(2*5 + 15*8/3)=400
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