Ciąg (an) jest określony wzorem an = (-1)n * (n2 - 2n) wtedy :
a) a3 >3
b) a3 = 3
c) a3< 2
d) a3 = 2
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a₃=(-1)³×(3²-2×3)=-1×9-6)=-1×3=-3
a₃<2
odp. c]
a3= (-1)³*(3²-2*3)= -1* (9 - 6) = -1 * 3 = -3
a3<2
ODPOWIEDŹ C