dany jest ciąg arytmetyczny -7, -4, -1... 50-ty wyraz tego ciagu jest rowny
a) 140
b) 143
c) 154
d) 157
a1=-7 , r=3 (bo -4-(-7)=-4+7=3)
an = a1 + (n-1)r
a50= -7 + 49*3 =
= -7 + 147 =
= 140 odp.a)
ODP (A)
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a1=-7 , r=3 (bo -4-(-7)=-4+7=3)
an = a1 + (n-1)r
a50= -7 + 49*3 =
= -7 + 147 =
= 140 odp.a)
ODP (A)
POZDRAWIAM!!!!!!!!!!!