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16:6=2 reszta 4 czyli 2,66667
r=6
150:6=25
154:6=25,66667
a₁=154
300:6=50
298:6=49,6667
an=a1+(n-1)*r
298=154+(n-1)*6
6n=150
n=25
Odp. Jest 25 wyrazów
Sn=((a1+an)/2) *n
Sn=452/2 *25
Sn=226*25
Sn=5650