Bestimme Aufgaben zu den Folgen

a)
a13 = 1+(13-1)*1) = 13
a18 = 1+(18-1)*1) = 18
s10 = 10(2*1+9*1)
         2
= 55
s20 = 20(2*1+19*1)
       2
= 210

b)
a8 = 3+(8-1)*2) = 17
a11 = 3+(11-1)*2) = 23
s8 = 8(2*3+7*2)
         2
= 80
s14 = 14(2*3+13*2)
       2
= 224

c)
a6 = 2+(6-1)*3) = 17
a12 = 2+(12-1)*3) = 35
a18 = 2+(18-1)*3) = 53
s10 = 10(2*2+9*3)
       2
= 155

d)
a17 = 4+(17-1)*5) = 84
a24 = 4+(24-1)*5) = 119
s6 = 6(2*4+5*5)
      2
= 99
s24 = 24(2*4+23*5)
       2
= 1476



 


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