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