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b3=30*1\3=10
b4=10*1\3=10\3
B) ciąg malejący
c)
S4=b1* 1-g³ \ 1-g=
90 * 27\27 -1\27 \ 3\3 -1\3=
90 * 26\27 ÷ 2\3=
90 * 26\27 * 3\2=
90 * 13\9 =1170\9 =130
b4=90*(1/3)3
b4=90*1/27
b4=90/27
ciąg maleje ponieważ q>0 i b1>0
S4=b1*(1-q3)/1-q
S4=130