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Sn = ((a1 + an)/2)*n
407=(62+12)/2*n
407=74/2 *n
407=37n |:37
n=407/37 =11
Odp: n=11
407=74/2 *n
407=37n /:37
n=11
Liczba wyrazów ciągu arytmetycznego wynosi 11.
Sn = (1/2)*[a1 + an] * n
407 = (1/2)*[62 + 12] *n
407 = 0,5*74 *n ---> n = 407 : 37 = 11
odp, Ciąg ma 11 wyrazów.