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Find the sum of AP 101+99+97+........+47

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Find the sum of AP 101+99+97+........+47
  • 1 answers

Deepti Choudhary 8 years, 2 months ago

a=101,d=101-99= -2, last term (an) =47 an=a+(n-1)d 47=101+(n-1)-2 -54=(n-1)-2 n-1=27 n =28 Sn = n/2*(a+l) = 28/2*(101+47) = 14*148 = 2072
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