io789 io789
  • 11-07-2017
  • Mathematics
contestada

# 46 please show your work

46 please show your work class=

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jimthompson5910 jimthompson5910
  • 11-07-2017
Replace every n with 15 to get 15*(15-1)/2 = 15*14/2 = 15*7 = 105

Answer is choice C
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