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JackelineSophy JackelineSophy
  • 16-08-2015
  • Mathematics
Answered

Find S11 for 3 + 1 + (-1) + (-3) +… A. -77 B. -75 C. -73 D. -71

Verified Answer :

Benjamin16
Benjamin16 Benjamin16
  • 16-08-2015

\(r=1-3=-2 \\ \\ a_{1}=3 \\ \\ n=11 \\ \\ S_{11}= \frac{2*3+(11-1)*(-2)}{2} *11= \frac{6-2*10}{2}*11=-7*7=-77\)

\\\ Ben

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