tolong ya buat bsk yg c sma d doang

c.barisan geometri
a= 1
r = 2
S6 = a( r^6 -1)/(r-1)
= 1(2^6-1)/(2-1)
= 64

d. barisan geometri
a= 45
r = 1/3
S6= a( 1 - r^6 ) / (1-r)
= 45( 1 - (1/3^6))/(1 - 1/3)
= 45( 1 - 1/729) /(2/3)
= 45 ( 728/729) ( 3/2)
= 45 (364/243)
= 16380/243
= 1820/27