b1=72; b2=12
b2=b1*q; q=b2/b1=12/72=1/6
b6=b2 * q⁴
b6=12 * (1/6)⁴=12/6⁴=12/(6*6³)=2/6³=2/(36*6)=1/(3*36)=1/108.
ответ: 1/6; 1/108.
