в1=3, вn+1=2вn -геом. прогрессия
в7-? q-?
b2=2b1=2*3=6
q=b2/b1=2
b7=b1*q^6=3*2^6=3*64=192
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b2=2b1=2*3=6
q=b2/b1=2
b7=b1*q^6=3*2^6=3*64=192