u1 = 2(2)^1-1 = 2 = a
u2 = 2(2)^2-1 = 4 = ar
u2/u1 = ar/a
4/2 = r
2 = r
maka,
sn = (a(r^n-1))/(r-1)
s6 = (2(2^6-1))/(2-1)
= (2(64-1))/1
= 2(63)
= 126 (D)
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u1 = 2(2)^1-1 = 2 = a
u2 = 2(2)^2-1 = 4 = ar
u2/u1 = ar/a
4/2 = r
2 = r
maka,
sn = (a(r^n-1))/(r-1)
s6 = (2(2^6-1))/(2-1)
= (2(64-1))/1
= 2(63)
= 126 (D)