Question

Cum sa calculam progresi geometrica daca q=1/3 bn=1/81 n=4, sa se calculeze b1 si Sn! URGENT! Dau coroana

Answer 1

Pai daca avem q=1/3 si bn=1/81 unde n=4 inseamna ca:

B4= b1*1/3*1/3*1/3 => b1= b4/(1/27)=27/81=1/3

Sn= 1/3* ( 1/81-1)/ (1/3-1)= 40/81

Sper ca intelegi ^-^