azarco7879
azarco7879 azarco7879
  • 01-03-2018
  • Mathematics
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What's the explicit formula HELP

Whats the explicit formula HELP class=

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musiclover10045
musiclover10045 musiclover10045
  • 01-03-2018
replace N with 6

6(6+1)(2(6)+1) / 6

(6*7*13) / 6

546 / 6 = 91

Answer is C
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