diketahui deret geometri : 3+6+12+24+48+..+Un.Tentukan:a.rasio b.U7 c.S7

rasio = u2/u1
=6/3
=2

b) U7=ar^6
=3.2^6
=3.64
=192

c) S7= a(r^7-1)/r-1
=3(2^7-1)/2-1
=3(127)/1
=381